CN105790719B - Method and device for improving DPD performance of radio frequency power amplifier - Google Patents
Method and device for improving DPD performance of radio frequency power amplifier Download PDFInfo
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Abstract
The invention discloses a method and a device for improving DPD performance of a radio frequency power amplifier, and relates to the field of bias circuits of the radio frequency power amplifier, wherein the method comprises the following steps: receiving a radio frequency signal subjected to matching amplification treatment from a radio frequency signal source; the method comprises the steps of filtering high-frequency radio frequency signals by using a radio frequency bypass capacitor arranged in a radio frequency power amplifier bias circuit, filtering low-frequency modulation envelope signals by using a video bypass capacitor arranged in the radio frequency power amplifier bias circuit, and reducing and smoothing low-frequency impedance of the radio frequency power amplifier by using a filter network arranged in the radio frequency power amplifier bias circuit. The invention can improve the DPD performance of the radio frequency power amplifier, especially the broadband DPD performance, and meet the wireless high-speed requirement by providing a filtering method for improving the DPD performance of the radio frequency power amplifier.
Description
Technical Field
The invention relates to the field of bias circuits of radio frequency power amplifiers, in particular to a filtering method and a filtering device for a drain bias circuit for improving Digital Predistortion (DPD) performance of a radio frequency power amplifier.
Background
With the continuous development of communication equipment and the increase of the number of wireless communication users, the broadband coverage requirement for signals is also increased, the mobile communication system puts higher demands on the radio frequency transmitter, the radio frequency power amplifier is an important component part in the transmitter, and the nonlinear characteristics between the input and the output of the radio frequency power amplifier can distort signals and reduce the communication quality.
In addition to the input signal and bandwidth, factors affecting the nonlinearity of the power amplifier are also non-negligible aspects of the signal envelope, particularly in high efficiency digital modulation schemes, where the linearity of the power amplifier is very sensitive to signal envelope frequency variations, and can cause not only discontinuous amplitude and phase distortions of the output signal, but also asymmetry of the upper and lower sidebands of intermodulation distortion products in the output spectrum. Memory effects in electricity are defined as the variation in amplitude and phase of distortion products due to the envelope frequency of the signal. The smooth memory effect does not harm the power amplifier itself, however, when DPD is used to cancel intermodulation distortion products, intermodulation sidebands change continuously with changes in envelope frequency, whereas predistortion signals are typically phase-constant, so memory effects severely limit the maximum effect achievable by cancellation techniques.
Joel h.k.vuolevi et al propose to reduce the memory effect by optimizing the source impedance, increasing the linearity of the power amplifier. Later Joel H.K.Vuolev et al also put forward a very simple method of circuit implementation, namely envelope injection technology, the principle is to inject a low-frequency envelope signal into the input end of the power amplifier to offset the distortion products of the power amplifier, experiments prove that better efficiency is achieved, and the two methods are the optimization methods proposed for the electric memory effect. Slim Boumaiza et al propose a thermal memory effect model of a power amplifier for a thermal memory effect generation mechanism and a temperature compensation circuit for a predistortion linearization circuit.
Both theory and experiment prove that the memory effect existing in the power amplifier worsens the linearity of the power amplifier, so that the DPD performance of the linearization technology widely adopted at present is obviously reduced. Meanwhile, the self characteristics of the existing semiconductor device and the bandwidth response of a circuit architecture are limited, and the space for improving the DPD performance is very limited, so that the effect is very important for the filtering treatment of the bias circuit, but the effect of filtering realization is complex, and the design for improving the DPD performance is less.
Disclosure of Invention
The invention aims to provide a method and a device for improving the performance of a DPD (digital video) of a radio frequency power amplifier, which can solve the problem that the performance of the DPD of a linearization technology is obviously reduced due to the memory effect in the radio frequency power amplifier.
According to one aspect of the present invention, there is provided a method for improving performance of a radio frequency power amplifier DPD, comprising:
Receiving a radio frequency signal subjected to matching amplification treatment from a radio frequency signal source;
the method comprises the steps of filtering high-frequency radio frequency signals by using a radio frequency bypass capacitor arranged in a radio frequency power amplifier bias circuit, filtering low-frequency modulation envelope signals by using a video bypass capacitor arranged in the radio frequency power amplifier bias circuit, and reducing and smoothing low-frequency impedance of the radio frequency power amplifier by using a filter network arranged in the radio frequency power amplifier bias circuit so as to improve DPD performance of the radio frequency power amplifier.
Preferably, the filter network is an RC filter circuit in parallel with a video capacitor.
Preferably, the step of reducing and smoothing the low frequency impedance of the rf power amplifier using a filter network provided in the bias circuit of the rf power amplifier means reducing the rate of change of the low frequency impedance of the rf power amplifier using the filter network to reduce the memory effect of the rf power amplifier.
Preferably, the step of reducing the rate of change of the low frequency impedance of the rf power amplifier by using the filter network to reduce the memory effect of the rf power amplifier includes:
After the low-frequency modulation envelope signal is filtered, the amplitude variation and the phase variation of the frequency response of the obtained low-frequency modulation envelope signal are reduced;
And determining that the change rate of the low-frequency impedance is reduced according to the reduced amplitude change amount and the reduced phase change amount, thereby determining that the memory effect of the radio-frequency power amplifier is reduced.
Preferably, the step of reducing the rate of change of the low frequency impedance of the rf power amplifier by using the filter network to reduce the memory effect of the rf power amplifier includes:
When the memory effect of the power amplifier is stronger and the Video Bandwidth (VBW) is smaller than 2 times of the signal bandwidth, the filter network is utilized to carry out low-frequency filtering on the radio frequency signal, so that the change rate of the low-frequency impedance of the radio frequency power amplifier is reduced, and the memory effect of the radio frequency power amplifier is reduced.
Preferably, the step of reducing the rate of change of the low frequency impedance of the rf power amplifier by using the filter network to reduce the memory effect of the rf power amplifier includes:
when the signal peak-to-average ratio (PAR: peak to Average Radio) causes the radio frequency power to compress, raise or reduce the output power and intermodulation index has no obvious change, the filtering network is utilized to carry out low-frequency filtering on the broadband signal, so as to reduce the change rate of the low-frequency impedance of the radio frequency power amplifier and reduce the memory effect of the radio frequency power amplifier.
According to another aspect of the present invention, there is provided an apparatus for improving performance of a DPD of a rf power amplifier, including:
the receiving module is used for receiving the radio frequency signals which are subjected to matching amplification processing from the radio frequency signal source;
The filtering module is used for filtering high-frequency radio-frequency signals by utilizing a radio-frequency bypass capacitor arranged in the radio-frequency power amplifier bias circuit, filtering low-frequency modulation envelope signals by utilizing a video bypass capacitor arranged in the radio-frequency power amplifier bias circuit, and reducing and smoothing low-frequency impedance of the radio-frequency power amplifier by utilizing a filtering network arranged in the radio-frequency power amplifier bias circuit.
Preferably, the filtering module further comprises:
And the reducing submodule is used for reducing the change rate of the low-frequency impedance of the radio-frequency power amplifier by utilizing the filter network so as to reduce the memory effect of the radio-frequency power amplifier.
Preferably, the reducing submodule further includes:
And the radio frequency unit is used for carrying out low-frequency filtering on the radio frequency signal by utilizing the filtering network when the memory effect of the radio frequency power amplifier is stronger and the video bandwidth is smaller than the signal bandwidth of 2 times, so that the change rate of the low-frequency impedance of the radio frequency power amplifier is reduced and the memory effect of the radio frequency power amplifier is reduced.
Preferably, the reducing submodule further includes:
and the broadband unit is used for carrying out low-frequency filtering on the broadband signal by utilizing the filtering network when the signal peak-to-average ratio causes radio frequency power compression, the output power is increased or reduced and intermodulation indexes are not obviously changed, so that the change rate of low-frequency impedance of the radio frequency power amplifier is reduced, and the memory effect of the radio frequency power amplifier is reduced.
Compared with the prior art, the invention has the beneficial effects that: the DPD performance of the radio frequency power amplifier, especially the wideband DPD performance, can be improved by providing a filtering method for improving the DPD performance of the radio frequency power amplifier, so as to meet the wireless high-speed requirement.
Drawings
Fig. 1 is a schematic diagram of a method for improving DPD performance of a rf power amplifier according to an embodiment of the present invention;
fig. 2 is a block diagram of an apparatus for improving DPD performance of a rf power amplifier according to an embodiment of the present invention;
Fig. 3 is a schematic diagram of a bias circuit for improving DPD performance of an rf power amplifier according to an embodiment of the present invention;
fig. 4 is a schematic diagram of broadband DPD linear data comparison of a bias circuit for improving DPD performance of a rf power amplifier according to an embodiment of the present invention;
Fig. 5 is a schematic diagram of a simulation comparison of a bias circuit for enhancing DPD performance of an rf power amplifier according to an embodiment of the present invention;
Fig. 6 is a schematic diagram of a system for improving DPD performance of an rf power amplifier according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a typical Doherty power amplifier for improving DPD performance of a radio frequency power amplifier according to an embodiment of the present invention.
Detailed Description
The following detailed description of the preferred embodiments of the present invention is provided in conjunction with the accompanying drawings, and it is to be understood that the preferred embodiments described below are merely illustrative and explanatory of the invention, and are not restrictive of the invention.
Fig. 1 is a schematic diagram of a method for improving DPD performance of a rf power amplifier according to an embodiment of the present invention, where the specific steps are as follows:
step S1: and receiving the radio frequency signal subjected to matching amplification from the radio frequency signal source.
Step S2: the method comprises the steps of filtering high-frequency radio frequency signals by using a radio frequency bypass capacitor arranged in a radio frequency power amplifier bias circuit, filtering low-frequency modulation envelope signals by using a video bypass capacitor arranged in the radio frequency power amplifier bias circuit, and reducing and smoothing low-frequency impedance of the radio frequency power amplifier by using a filter network arranged in the radio frequency power amplifier bias circuit so as to improve DPD performance of the radio frequency power amplifier.
In step S2, the filter network is an RC filter circuit in parallel with a video bypass capacitor.
Further, the step of reducing and smoothing the low-frequency impedance of the rf power amplifier by using the filter network provided in the bias circuit of the rf power amplifier means that the rate of change of the low-frequency impedance of the rf power amplifier is reduced by using the filter network so as to reduce the memory effect of the rf power amplifier.
Further, the step of reducing the rate of change of the low frequency impedance of the rf power amplifier by using the filter network to reduce the memory effect of the rf power amplifier includes:
After the low-frequency modulation envelope signal is filtered, the amplitude variation and the phase variation of the frequency response of the obtained radio frequency power signal are reduced;
And determining that the change rate of the low-frequency impedance is reduced according to the reduced amplitude change amount and the reduced phase change amount, thereby determining that the memory effect of the radio-frequency power amplifier is reduced.
Further, when the memory effect of the power amplifier is stronger and the video bandwidth is smaller than the signal bandwidth of 2 times, the filtering network is utilized to carry out low-frequency filtering on the radio frequency signal, so that the change rate of the low-frequency impedance of the radio frequency power amplifier is reduced, and the memory effect of the radio frequency power amplifier is reduced.
Further, when the signal peak-to-average ratio causes radio frequency power compression, the output power is increased or reduced, and intermodulation indexes are not changed obviously, the filtering network is utilized to carry out low-frequency filtering on the broadband signal, so that the change rate of low-frequency impedance of the radio frequency power amplifier is reduced, and the memory effect of the radio frequency power amplifier is reduced.
Fig. 2 is a block diagram of an apparatus for improving DPD performance of a rf power amplifier according to an embodiment of the present invention, as shown in fig. 2, including: a receiving module and a filtering module.
The receiving module is used for receiving the radio frequency signals which are subjected to matching amplification processing from the radio frequency signal source.
The filtering module is used for filtering high-frequency radio-frequency signals by using a radio-frequency bypass capacitor arranged in the radio-frequency power amplifier bias circuit, filtering low-frequency modulation envelope signals by using a video bypass capacitor arranged in the radio-frequency power amplifier bias circuit, and reducing and smoothing low-frequency impedance of the radio-frequency power amplifier by using a filtering network arranged in the radio-frequency power amplifier bias circuit. The reducing submodule of the filtering module is used for reducing the change rate of the low-frequency impedance of the radio-frequency power amplifier by utilizing the filtering network so as to reduce the memory effect of the radio-frequency power amplifier. The radio frequency unit of the reducing sub-module is used for carrying out low-frequency filtering on the radio frequency signal by utilizing the filtering network when the memory effect of the radio frequency power amplifier is stronger and the video bandwidth is smaller than the signal bandwidth, so that the change rate of the low-frequency impedance of the radio frequency power amplifier is reduced, and the memory effect of the radio frequency power amplifier is reduced. The broadband unit of the reducing submodule is used for carrying out low-frequency filtering on the broadband signal by utilizing the filtering network when the signal peak-to-average ratio causes radio frequency power compression, the output power is increased or reduced and intermodulation indexes are not obviously changed, so that the change rate of low-frequency impedance of the radio frequency power amplifier is reduced, and the memory effect of the radio frequency power amplifier is reduced.
Fig. 3 is a schematic diagram of a bias circuit for improving DPD performance of a radio frequency power amplifier according to an embodiment of the present invention, where, as shown in fig. 3, the bias circuit is composed of a section of microstrip line and a group of parallel filter capacitors, and the filter capacitors in the bias circuit include a radio frequency bypass capacitor, a video bypass capacitor, and a filter network for improving DPD performance, where the length of the microstrip line is equal to or less than 1/4 of the wavelength of the operating frequency. The radio frequency bypass capacitor filters out radio frequency signals of the modulation signals, and the video bypass capacitor (the capacitance value is 10 mu and 220 mu) filters out video signals of modulation envelopes.
Fig. 4 is a schematic diagram of comparison of wideband DPD linear data of a bias circuit for improving DPD performance of a rf power amplifier according to an embodiment of the present invention, as shown in fig. 4, a conventional bias circuit is adopted for a certain type of rf power amplifier, and compared with the DPD performance of a 50MHz signal bandwidth, the ACPR: adjacent Channel Power Ratio index of a 60MHz signal is significantly degraded, and the index critical has no margin. When the DPD single board collects feedback signal data, the memory effect is found to be stronger, the output power is increased or reduced, and the index is not changed obviously. By using the S21 passive test method, the VBW of the Carrier power amplifier tube is measured to be about 120MHz, the test signal with the bandwidth of 60MHz which is just 2 times can be satisfied, and the allowance is smaller. In addition, the ACPR index of the 60MHz signal is obviously improved, and the index test allowance is met.
Fig. 5 is a schematic diagram of simulation comparison of a bias circuit for improving DPD performance of a radio frequency power amplifier according to an embodiment of the present invention, as shown in fig. 5, the left graph is a frequency response of a conventional bias circuit to a low frequency radio frequency signal, which is an effect of a video bypass capacitor to a wideband signal envelope frequency signal, the low frequency radio frequency signal outputs the wideband signal envelope frequency signal to the power amplifier, the visible bandwidth of a 60MHz wideband signal is 60MHz, and the memory effect of the power amplifier is affected by the amplitude and phase variation of the frequency response. The right graph shows the frequency response of the bias circuit to the low-frequency modulation envelope signal, namely the frequency response of the video bypass capacitor and the RC filter circuit to the low-frequency modulation envelope signal together.
When the RC filter circuit is adopted in the filter network for improving the DPD performance, the upper side line represents the phase, the lower side line represents the amplitude value, and after the RC filter circuit is added, the low-frequency impedance is obviously reduced and smoothed, the impedance mutation is improved, the influence of the memory effect on the DPD is reduced, and especially the influence on the DPD performance of the broadband signal is more obvious.
Other examples of what one skilled in the art would obtain without undue burden based on the present patent are within the scope of protection of the present patent. In order to make the present patent more clearly understood by those skilled in the relevant art, a detailed description of specific embodiments of the present patent is provided with reference to fig. 6 and 7.
Fig. 6 is a schematic diagram of a system for improving DPD performance of a rf power amplifier according to an embodiment of the present invention, where as shown in fig. 6, the rf power amplifier system includes: the power amplifier comprises a radio frequency source, an input matching network, a power amplifier tube, an output matching network, a load, an input bias circuit and an output bias circuit. The filter capacitor in the output bias circuit comprises a radio frequency bypass capacitor, a video bypass capacitor and a filter network for improving DPD performance.
Fig. 7 is a schematic structural diagram of a typical Doherty power amplifier for improving DPD performance of a radio frequency power amplifier according to an embodiment of the present invention, where, as shown in fig. 7, the typical Doherty power amplifier includes: the carrier amplifier and the peak amplifier are suitable for a filtering method of an output bias circuit of an amplifier in a typical Doherty power amplifier architecture, and are also suitable for radio frequency power amplifier circuits in other architecture circuits.
The filtering method of the bias circuit of the radio frequency power amplifier provided by the embodiment of the invention is described in detail, the above is only one embodiment of the invention, the protection scope of the patent is not limited to the embodiment, and the modifications and variations made by non-creative labor of the person skilled in the art belong to the protection scope of the patent.
In summary, the invention has the following technical effects: the DPD performance of the radio frequency power amplifier, especially the wideband DPD performance, can be improved by providing a filtering method for improving the DPD performance of the radio frequency power amplifier, so as to meet the wireless high-speed requirement. The concrete steps are as follows:
(1) The low-frequency impedance is reduced obviously, the impedance mutation is improved, and the influence of the memory effect on DPD is reduced.
(2) The second-order intermodulation amplitude is reduced, the third-order intermodulation index is optimized, and the linearity index is improved.
(3) The change rate of the low-frequency impedance is reduced by improving the output bias circuit, and the influence on the matching state of the power amplifier is reduced.
(4) Compared with the strong memory effect of the power amplifier, the VBW of the Carrier power amplifier tube is smaller than the signal bandwidth, and the improvement effect is obvious.
(5) For broadband signals, a larger signal PAR causes power amplification compression, but the output power is increased or reduced, the index is not changed obviously, and the improvement effect is obvious.
Although the present invention has been described in detail hereinabove, the present invention is not limited thereto and various modifications may be made by those skilled in the art in accordance with the principles of the present invention. Therefore, all modifications made in accordance with the principles of the present invention should be understood as falling within the scope of the present invention.
Claims (7)
1. A method for improving DPD performance of a rf power amplifier, comprising:
Receiving a radio frequency signal subjected to matching amplification treatment from a radio frequency signal source;
The method comprises the steps of filtering a high-frequency radio frequency signal by using a radio frequency bypass capacitor arranged in an output bias circuit of the radio frequency power amplifier, filtering a video signal of a modulation envelope by using a video bypass capacitor arranged in the output bias circuit of the radio frequency power amplifier, and filtering a low-frequency modulation envelope signal by using an RC filter circuit arranged in the output bias circuit of the radio frequency power amplifier and used for improving the DPD performance of the digital predistortion, so that the amplitude variation and the phase variation of the frequency response of the low-frequency modulation envelope signal are reduced, and the variation rate of the low-frequency impedance of the radio frequency power amplifier is reduced by the reduced amplitude variation and the phase variation of the frequency response of the low-frequency modulation envelope signal, thereby reducing the influence of the memory effect of the radio frequency power amplifier on the DPD performance of the radio frequency power amplifier.
2. The method of claim 1, wherein the RC filter circuit is connected in parallel with the video bypass capacitor.
3. The method according to claim 1, wherein the method further comprises:
When the memory effect of the power amplifier is stronger and the video bandwidth is smaller than the signal bandwidth of 2 times, the RC filter circuit is utilized to carry out low-frequency filtering on the radio frequency signal, so that the change rate of the low-frequency impedance of the radio frequency power amplifier is reduced, and the memory effect of the radio frequency power amplifier is reduced.
4. The method according to claim 1, wherein the method further comprises:
When the signal peak-to-average ratio causes radio frequency power compression, the output power is increased or reduced, and intermodulation indexes are not changed obviously, the RC filter circuit is utilized to carry out low-frequency filtering on the broadband signal, so that the change rate of low-frequency impedance of the radio frequency power amplifier is reduced, and the memory effect of the radio frequency power amplifier is reduced.
5. An apparatus for improving performance of a DPD (radio frequency power amplifier), comprising:
the receiving module is used for receiving the radio frequency signals which are subjected to matching amplification processing from the radio frequency signal source;
The filtering module is used for filtering high-frequency radio-frequency signals by using a radio-frequency bypass capacitor arranged in the radio-frequency power amplifier output bias circuit, filtering video signals of a modulation envelope by using a video bypass capacitor arranged in the radio-frequency power amplifier output bias circuit, and filtering low-frequency modulation envelope signals by using an RC filtering circuit arranged in the radio-frequency power amplifier output bias circuit and used for improving Digital Predistortion (DPD) performance, so that amplitude variation and phase variation of frequency response of the low-frequency modulation envelope signals are reduced, and the change rate of low-frequency impedance of the radio-frequency power amplifier is reduced by the reduced amplitude variation and phase variation of frequency response of the low-frequency modulation envelope signals, thereby reducing the influence of memory effect of the radio-frequency power amplifier on the DPD performance of the radio-frequency power amplifier.
6. The apparatus of claim 5, wherein the filtering module further comprises:
and the radio frequency unit is used for carrying out low-frequency filtering on the radio frequency signal by utilizing the RC filter circuit when the memory effect of the power amplifier is stronger and the video bandwidth is smaller than the signal bandwidth of 2 times, so that the change rate of the low-frequency impedance of the radio frequency power amplifier is reduced, and the memory effect of the radio frequency power amplifier is reduced.
7. The apparatus of claim 5, wherein the filtering module further comprises:
and the broadband unit is used for carrying out low-frequency filtering on the broadband signal by utilizing the RC filter circuit when the signal peak-to-average ratio causes radio frequency power compression, the output power is increased or reduced and intermodulation indexes are not obviously changed, so that the change rate of low-frequency impedance of the radio frequency power amplifier is reduced, and the memory effect of the radio frequency power amplifier is reduced.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410820923.1A CN105790719B (en) | 2014-12-25 | 2014-12-25 | Method and device for improving DPD performance of radio frequency power amplifier |
| PCT/CN2015/086837 WO2016101627A1 (en) | 2014-12-25 | 2015-08-13 | Method and apparatus for increasing digital pre-distortion performance of radio frequency power amplifier |
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| CN201410820923.1A CN105790719B (en) | 2014-12-25 | 2014-12-25 | Method and device for improving DPD performance of radio frequency power amplifier |
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| CN105790719B true CN105790719B (en) | 2024-07-19 |
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| CN109257021A (en) * | 2018-10-30 | 2019-01-22 | 天津津航计算技术研究所 | A kind of circuit and method for improving data-link communication QPSK and modulating lower radio-frequency front-end memory effect |
| CN115800934B (en) * | 2022-11-25 | 2023-06-09 | 江苏大学 | Power amplifier matching optimization method based on inscribed polygon and reflection coefficient constraint |
| CN117595798B (en) * | 2024-01-12 | 2024-03-29 | 四川恒湾科技有限公司 | Circuit and method for improving efficiency of broadband power amplifier |
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| CN101662263A (en) * | 2008-08-27 | 2010-03-03 | 中国科学院微电子研究所 | Bias circuit for Ku-band matched field effect transistor |
| CN102098009A (en) * | 2010-12-20 | 2011-06-15 | 芯通科技（成都）有限公司 | Output match circuit of radio frequency (RF) power amplifier and design method thereof |
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| US5638025A (en) * | 1995-07-07 | 1997-06-10 | National Semiconductor Corporation | Amplified output stage containing N-channel output transistors and capacitive coupling stage |
| KR19990035994A (en) * | 1996-05-31 | 1999-05-25 | 엠. 제이. 엠. 반캄 | Apparatus having amplifier means with safety means and filter means connected to said amplifier means |
| JP3060981B2 (en) * | 1997-02-21 | 2000-07-10 | 日本電気株式会社 | Microwave amplifier |
| US6133792A (en) * | 1998-09-17 | 2000-10-17 | Telefonakteibolaget Lm Ericsson | Method and apparatus for preventing power amplifier saturation |
| US6111466A (en) * | 1999-03-22 | 2000-08-29 | Motorola, Inc. | Amplifier with feedback to provide bias adjustment |
| GB0313781D0 (en) * | 2003-06-13 | 2003-07-23 | Sepura Ltd | Amplifier impedance matching |
| CN100449939C (en) * | 2004-07-29 | 2009-01-07 | 中兴通讯股份有限公司 | Injection circuit with external predistortion |
| CN200947589Y (en) * | 2006-09-19 | 2007-09-12 | 凌君彦 | Circuit for eliminating dynamic open circuit of capacitor in audio amplifying circuit |
| JP4841394B2 (en) * | 2006-10-18 | 2011-12-21 | パナソニック株式会社 | Power amplifier |
| CN101814898B (en) * | 2010-05-14 | 2013-02-27 | 华为技术有限公司 | Radio-frequency amplifier and digital pre-distortion system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101662263A (en) * | 2008-08-27 | 2010-03-03 | 中国科学院微电子研究所 | Bias circuit for Ku-band matched field effect transistor |
| CN102098009A (en) * | 2010-12-20 | 2011-06-15 | 芯通科技（成都）有限公司 | Output match circuit of radio frequency (RF) power amplifier and design method thereof |
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