CN107846560B - UHF frequency band is with adjustable transmitter power amplifier mechanism - Google Patents
UHF frequency band is with adjustable transmitter power amplifier mechanism Download PDFInfo
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- CN107846560B CN107846560B CN201711320027.9A CN201711320027A CN107846560B CN 107846560 B CN107846560 B CN 107846560B CN 201711320027 A CN201711320027 A CN 201711320027A CN 107846560 B CN107846560 B CN 107846560B
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- 230000007246 mechanism Effects 0.000 title claims abstract description 35
- 239000003990 capacitor Substances 0.000 claims abstract description 110
- 230000005540 biological transmission Effects 0.000 claims abstract description 35
- 230000003321 amplification Effects 0.000 claims abstract description 23
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/38—Transmitter circuitry for the transmission of television signals according to analogue transmission standards
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Microwave Amplifiers (AREA)
- Transmitters (AREA)
Abstract
The invention provides an adjustable transmitter power amplification mechanism for UHF frequency bands, which comprises a power amplifier, a microstrip transmission line and an output port, wherein one end of the microstrip transmission line is connected with the output end of the power amplifier, and the other end of the microstrip transmission line is connected with the input end of the output port; the microstrip transmission line is connected with an adjusting capacitor assembly, a radio frequency switch is arranged between the adjusting capacitor assembly and the microstrip transmission line, one end of the adjusting capacitor assembly is connected with one end of the radio frequency switch, the other end of the adjusting capacitor assembly is grounded, and the adjusting capacitor assembly adjusts the capacitor to a preset capacitance value according to requirements. The adjustable transmitter power amplification mechanism for the UHF frequency band is provided with the adjusting capacitor component and the radio frequency switch, and the capacitor is adjusted to a preset capacitance value according to the requirement, as the impedance and the frequency have matching corresponding relations, the optimal working state requirements of the impedance of different frequencies in the power amplifier are realized, the adjustable function of the adjustable transmitter power amplification mechanism for the UHF frequency band is met, the performance of part of the power amplifier is not required to be sacrificed, and the optimal power output of the power amplification mechanism in different frequencies is realized.
Description
Technical Field
The invention relates to the field of transmitters, in particular to an adjustable transmitter power amplifier mechanism for UHF frequency bands.
Background
With the development of the age, the analog television at home and abroad is gradually turned off, and the digital television is spread on a large scale. Common digital television modes are DTMB, DVB-T and ASDB-T. Digital televisions are deployed in China with DTMB as a standard. Digital televisions can operate in the VHF (very high frequency) band and the UHF (ultra high frequency) band. The VHF frequency band is 167-223 MHz, and the UHF frequency band is 470-860 MHz. The VHF frequency band is narrow, and the key device of the digital television transmitter is a radio frequency power amplifier. The bandwidth of the VHF band is usually narrow, and a power amplifier is easy to cover the full band. UHF frequency band spans 390MHz and is generally divided into a plurality of frequency bands to design a power amplifier. Because of different frequencies and different impedances, transmitter manufacturers need to do different matched power amplifiers, and usually do 3-4 kinds of power amplifiers. In order to meet the full frequency band, a few manufacturers only sacrifice the performance of part of power amplifiers to realize the full frequency band use.
Disclosure of Invention
The invention aims to: aiming at the technical problems, the invention provides an adjustable transmitter power amplification mechanism for UHF frequency bands, which is used for solving the problem that one power amplifier cannot adapt to different frequency bands.
The adjustable transmitter power amplification mechanism for the UHF frequency band comprises a power amplifier, a microstrip transmission line and an output port, wherein one end of the microstrip transmission line is connected with the output end of the power amplifier, and the other end of the microstrip transmission line is connected with the input end of the output port;
The microstrip transmission line is connected with an adjusting capacitor assembly, a radio frequency switch is arranged between the adjusting capacitor assembly and the microstrip transmission line, one end of the adjusting capacitor assembly is connected with one end of the radio frequency switch, the other end of the adjusting capacitor assembly is grounded, and the adjusting capacitor assembly adjusts the capacitor to a preset capacitance value according to the requirement.
According to the technical scheme, the capacitor adjusting component and the radio frequency switch are arranged, so that the capacitor can be adjusted to a preset capacitance value according to the requirement, and the matching impedance is determined by the capacitor and the frequency, so that the requirement on impedance at different frequencies can be met by adjusting the capacitance value, the adjustable function of the UHF frequency band adjustable transmitter power amplifier mechanism is met, the performance of part of power amplifier is not required to be sacrificed, the requirement that one power amplifier mechanism is used in full frequency band is met, and the power amplifier mechanism has optimal power output at different frequencies.
In one embodiment, the number of the radio frequency switches is three, namely a first radio frequency switch, a second radio frequency switch and a third radio frequency switch, the adjusting capacitor assembly comprises a first matching capacitor, a second matching capacitor and a third matching capacitor, the input ends of the first radio frequency switch, the second radio frequency switch and the third radio frequency switch are respectively connected with one ends of the first matching capacitor, the second matching capacitor and the third matching capacitor, and the output ends of the first radio frequency switch, the second radio frequency switch and the third radio frequency switch are respectively connected with the microstrip transmission line;
The first matching capacitor, the second matching capacitor and the third matching capacitor are different in capacitance value, the capacitance value of the first matching capacitor is larger than that of the second matching capacitor, and the capacitance value of the second matching capacitor is larger than that of the third matching capacitor.
According to the technical scheme, the first matching capacitor, the second matching capacitor and the third matching capacitor are arranged, and the frequency of the power amplification mechanism is adjusted to a preset frequency band through the switch control of the first radio frequency switch, the second radio frequency switch and the third radio frequency switch, so that the requirements of the power amplification mechanism with different frequencies are met.
In one embodiment, the switch further comprises a first switch bus, and the first switch bus is connected with the first radio frequency switch, the second radio frequency switch and the third radio frequency switch respectively.
In one embodiment, the tuning capacitance component is a tunable capacitance.
In one embodiment, the switch further comprises a second switch bus, the second switch bus is connected with the radio frequency switch, an input line of the radio frequency switch is connected with one end of the adjustable capacitor, and the other end of the adjustable capacitor is grounded.
In one embodiment, the number of the radio frequency switches is three, namely a radio frequency switch I, a radio frequency switch II and a radio frequency switch III, wherein the radio frequency switch I, the radio frequency switch II and the radio frequency switch III are arranged in parallel, and the switch bus is respectively connected with the radio frequency switch I, the radio frequency switch II and the radio frequency switch III;
The first radio frequency switch, the second radio frequency switch and the third radio frequency switch are connected in parallel and then connected with the adjustable capacitor in series, and the output ends of the first radio frequency switch, the second radio frequency switch and the third radio frequency switch are respectively connected with the microstrip transmission line.
According to the technical scheme, the adjustable capacitor, the first radio frequency switch, the second radio frequency switch and the third radio frequency switch are adopted, and one of the first radio frequency switch, the second radio frequency switch and the third radio frequency switch is turned on according to the requirement through the capacitance adjustment of the adjustable capacitor, so that the requirements of power amplification mechanisms with different frequencies are met.
The beneficial effects are that: compared with the prior art, the adjustable transmitter power amplification mechanism for the UHF frequency band has the following advantages:
1. Because the capacitor adjusting component and the radio frequency switch are arranged, the capacitor can be adjusted to a preset capacitance value according to the need, and the capacitor and the frequency have a matching corresponding relation, the adjustable function of the UHF frequency band adjustable transmitter power amplifier mechanism can be met by adjusting the capacitance value, the performance of part of the power amplifier is not required to be sacrificed, the requirement that one power amplifier mechanism is used in the full frequency band is met, and the power amplifier mechanism has optimal power output in different frequencies.
2. The adjustable capacitor and the first, second and third radio frequency switches are adopted, so that the power amplification mechanism requirements of different frequencies are met by adjusting the capacitance of the adjustable capacitor and simultaneously opening one of the first, second and third radio frequency switches according to the requirements.
Drawings
Fig. 1 is a schematic structural diagram of a power amplifier mechanism of an adjustable transmitter for UHF band in embodiment 1;
Fig. 2 is a schematic structural diagram of a power amplifying mechanism of an adjustable transmitter for UHF band in embodiment 2;
fig. 3 is a schematic structural diagram of a power amplifier mechanism of an adjustable transmitter for UHF band in embodiment 3.
Detailed Description
Example 1
Referring to fig. 1, an adjustable transmitter power amplification mechanism for a UHF band includes a power amplifier 1, a microstrip transmission line 2, and an output port 3, wherein one end of the microstrip transmission line 2 is connected with an output end of the power amplifier 1, and the other end is connected with an input end of the output port 3; the microstrip transmission line 2 is connected with an adjusting capacitor assembly 4, a radio frequency switch 5 is arranged between the adjusting capacitor assembly 4 and the microstrip transmission line 2, one end of the adjusting capacitor assembly 4 is connected with one end of the radio frequency switch 5, the other end of the adjusting capacitor assembly is grounded, and the adjusting capacitor assembly 4 adjusts the capacitance to a preset capacitance value according to the requirement. The number of the radio frequency switch 5 and the adjusting capacitor assembly 4 can be set according to the requirement.
In this embodiment, the number of the rf switches 5 is three, namely, an rf switch one 51, an rf switch two 52 and an rf switch three 53, the adjusting capacitor assembly 4 includes a matching capacitor one 41, a matching capacitor two 42 and a matching capacitor three 43, the input ends of the rf switch one 51, the rf switch two 52 and the rf switch three 53 are respectively connected with one ends of the matching capacitor one 41, the matching capacitor two 42 and the matching capacitor three 43, and the output ends of the rf switch one 51, the rf switch two 52 and the rf switch three 53 are respectively connected with the microstrip transmission line 2; the capacitance values of the first matching capacitor 41, the second matching capacitor 42 and the third matching capacitor 43 are different, the capacitance value of the first matching capacitor 41 is larger than that of the second matching capacitor 42, and the capacitance value of the second matching capacitor 42 is larger than that of the third matching capacitor 43.
In the embodiment, the frequency of the power amplification mechanism is 470-860 MHz, and the frequency adjustment is performed by adopting a mode of matching three capacitors with three radio frequency switches. The capacitance value of the first matching capacitor 41 is 14.5pF, the capacitance value of the second matching capacitor 42 is 16.8pF, and the capacitance value of the third matching capacitor 43 is 20pF. The microstrip transmission line 2 is a 50ohm transmission line.
The working process of the adjustable transmitter power amplification mechanism for the UHF frequency band is as follows: and according to the required frequency range value, a corresponding radio frequency switch and a matching capacitor are opened, so that a preset frequency range is achieved. If the first radio frequency switch 51 and the first matching capacitor 41 are opened, the transmission frequency of the power amplification mechanism is 760-860 MHz; the second radio frequency switch 52 and the second matching capacitor 42 are opened, so that the transmission frequency of the power amplification mechanism is 560-730 MHz; by opening the third radio frequency switch 53 and the third matching capacitor 43, the transmission frequency of the power amplification mechanism is 470-560.
Example 2
Referring to fig. 2, the difference between the present embodiment and embodiment 1 is that: the switch bus I6 is connected with the radio frequency switch I51, the radio frequency switch II 52 and the radio frequency switch III 53 respectively. The working states of the first radio frequency switch 51, the second radio frequency switch 52 and the third radio frequency switch 53 are controlled through the first switch bus 6.
Example 3
Referring to fig. 3, the difference between the present embodiment and embodiment 1 is that: in this embodiment, the second switch bus 7 is also included. Wherein the tuning capacitor assembly 4 is a tuning capacitor 44. The first radio frequency switch 51, the second radio frequency switch 52 and the third radio frequency switch 53 are arranged in parallel, and the second switch bus 7 is respectively connected with the first radio frequency switch 51, the second radio frequency switch 52 and the third radio frequency switch 53;
The first rf switch 51, the second rf switch 52, and the third rf switch 53 are connected in parallel and then connected in series with the adjustable capacitor 44, and output ends of the first rf switch 51, the second rf switch 52, and the third rf switch 53 are respectively connected with the microstrip transmission line 2.
In this embodiment, the capacitance of the adjustable capacitor 44 is adjusted, and one of the first rf switch 51, the second rf switch 52 and the third rf switch 53 is turned on as required, so as to reach a predetermined frequency range.
Claims (1)
1. The power amplification mechanism of the adjustable transmitter for the UHF frequency band is characterized by comprising a power amplifier (1), a microstrip transmission line (2) and an output port (3), wherein one end of the microstrip transmission line (2) is connected with the output end of the power amplifier (1), and the other end of the microstrip transmission line is connected with the input end of the output port (3);
An adjusting capacitor assembly (4) is connected to the microstrip transmission line (2), a radio frequency switch (5) is arranged between the adjusting capacitor assembly (4) and the microstrip transmission line (2), one end of the adjusting capacitor assembly (4) is connected with one end of the radio frequency switch (5), the other end of the adjusting capacitor assembly is grounded, and the adjusting capacitor assembly (4) adjusts a capacitor to a preset capacitance value according to requirements;
The number of the radio frequency switches (5) is three, namely a radio frequency switch I (51), a radio frequency switch II (52) and a radio frequency switch III (53), the adjusting capacitor assembly (4) comprises a matching capacitor I (41), a matching capacitor II (42) and a matching capacitor III (43), the input ends of the radio frequency switch I (51), the radio frequency switch II (52) and the radio frequency switch III (53) are respectively connected with one ends of the matching capacitor I (41), the matching capacitor II (42) and the matching capacitor III (43), and the output ends of the radio frequency switch I (51), the radio frequency switch II (52) and the radio frequency switch III (53) are respectively connected with the microstrip transmission line (2);
The capacitance values of the first matching capacitor (41), the second matching capacitor (42) and the third matching capacitor (43) are different, the capacitance value of the first matching capacitor (41) is larger than the capacitance value of the second matching capacitor (42), and the capacitance value of the second matching capacitor (42) is larger than the capacitance value of the third matching capacitor (43);
The using frequency of the power amplification mechanism is 470-860 MHz, and frequency adjustment is performed by adopting a mode that three capacitors are matched with three radio frequency switches; wherein, the capacitance value of the first matching capacitor 41 is 14.5pF, the capacitance value of the second matching capacitor 42 is 16.8pF, and the capacitance value of the third matching capacitor 43 is 20pF; the microstrip transmission line 2 is a 50ohm transmission line; the working process of the adjustable transmitter power amplification mechanism for the UHF frequency band is as follows: according to the required frequency range value, a corresponding radio frequency switch and a matching capacitor are opened, so that a preset frequency range is achieved; if the first radio frequency switch 51 and the first matching capacitor 41 are opened, the transmission frequency of the power amplification mechanism is 760-860 MHz; the second radio frequency switch 52 and the second matching capacitor 42 are opened, so that the transmission frequency of the power amplification mechanism is 560-730 MHz; the third radio frequency switch 53 and the third matching capacitor 43 are opened, so that the transmission frequency of the power amplification mechanism is 470-560;
The switch bus I (6) is respectively connected with the radio frequency switch I (51), the radio frequency switch II (52) and the radio frequency switch III (53);
The adjusting capacitor component (4) is an adjustable capacitor (44);
the switch bus II (7) is connected with the radio frequency switch (5), an input line of the radio frequency switch (5) is connected with one end of the adjustable capacitor (44), and the other end of the adjustable capacitor (44) is grounded;
The number of the radio frequency switches (5) is three, namely a radio frequency switch I (51), a radio frequency switch II (52) and a radio frequency switch III (53), the radio frequency switch I (51), the radio frequency switch II (52) and the radio frequency switch III (53) are arranged in parallel, and the switch bus II (7) is respectively connected with the radio frequency switch I (51), the radio frequency switch II (52) and the radio frequency switch III (53);
The first radio frequency switch (51), the second radio frequency switch (52) and the third radio frequency switch (53) are connected in parallel and then connected with the adjustable capacitor (44) in series, and the output ends of the first radio frequency switch (51), the second radio frequency switch (52) and the third radio frequency switch (53) are respectively connected with the microstrip transmission line (2); the predetermined frequency range is achieved by adjusting the capacitance of the tunable capacitor 44 while turning on one of the first rf switch 51, the second rf switch 52, and the third rf switch 53 as needed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711320027.9A CN107846560B (en) | 2017-12-12 | 2017-12-12 | UHF frequency band is with adjustable transmitter power amplifier mechanism |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711320027.9A CN107846560B (en) | 2017-12-12 | 2017-12-12 | UHF frequency band is with adjustable transmitter power amplifier mechanism |
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| CN107846560A CN107846560A (en) | 2018-03-27 |
| CN107846560B true CN107846560B (en) | 2024-06-11 |
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