CN105391404A - Graphene field effect transistor-based double-balanced mixer - Google Patents
Graphene field effect transistor-based double-balanced mixer Download PDFInfo
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- CN105391404A CN105391404A CN201510924414.8A CN201510924414A CN105391404A CN 105391404 A CN105391404 A CN 105391404A CN 201510924414 A CN201510924414 A CN 201510924414A CN 105391404 A CN105391404 A CN 105391404A
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Abstract
The invention discloses a graphene field effect transistor-based double-balanced mixer. The gates, sources and drains of four graphene field effect transistors are connected together in a crossing manner and are connected with differential input and output ports through an external circuit. According to the graphene field effect transistor-based double-balanced mixer of the invention, the gates, sources and drains of the four graphene field effect transistors are connected together in a crossing manner and are connected with the differential input and output ports through the external circuit, and therefore, based on a cross coupling mode, the high-frequency components of a circuit can be effectively inhibited, linearity can be improved, punch-through can be inhibited, and noises can be reduced.
Description
Technical field
The present invention relates to frequency mixer field, be specifically related to a kind of double balanced mixer based on graphene field effect pipe.
Background technology
In communication system and other electronic system, often need to utilize the circuit being called as frequency converter or frequency mixer that the signal in a certain radio frequency (RF) band is converted to another intermediate frequency (IF) band, or on the contrary.During this signal frequency transfer process at frequency mixer place, the ratio between the input signal power level before the output signal power level after conversion and conversion is called as conversion gain (CG), this value metric efficiency of transfer process.The bandwidth of operation of frequency mixer is often defined as making conversion gain keep reasonable high-caliber frequency band.
The output signal of frequency mixer can because transfer process non-linear and distortion and be mixed into spurious signal.Double balanced mixer is because it high spuiously suppresses (interport isolation) with the signals leakiness of port-to-port height and the selection be in daily use that becomes for frequency inverted.But existing silica-based mixer linearity degree is still not high.
Summary of the invention
The present invention is intended at least one of solve the problems of the technologies described above.
For this reason, the object of the invention is to propose a kind of double balanced mixer based on graphene field effect pipe.
To achieve these goals, embodiments of the invention disclose a kind of double balanced mixer based on graphene field effect pipe, comprise: the first graphene field effect pipe, the grid of described first graphene field effect pipe connects differential signal positive input terminal, the drain electrode of described first graphene field effect pipe connects radiofrequency signal negative input end, and the source electrode of described first graphene field effect pipe connects mixed frequency signal positive output end; Second graphene field effect pipe, the grid of described second graphene field effect pipe connects described difference positive input terminal, the drain electrode of described second graphene field effect pipe connects radiofrequency signal positive input terminal, and the source electrode of described first graphene field effect pipe connects mixed frequency signal negative output terminal; 3rd graphene field effect pipe, the grid of described 3rd graphene field effect pipe connects differential signal negative input end, the drain electrode of described 3rd graphene field effect pipe connects described radiofrequency signal negative input end, and the source electrode of described 3rd graphene field effect pipe connects described mixed frequency signal negative output terminal; With the 4th graphene field effect pipe, the grid of described 4th graphene field effect pipe connects described differential signal negative input end, the drain electrode of described 4th graphene field effect pipe connects described radiofrequency signal positive input terminal, and the source electrode of described 4th graphene field effect pipe connects described mixed frequency signal positive output end.
According to the double balanced mixer based on graphene field effect pipe of the embodiment of the present invention, the grid of four graphene field effect pipes, source electrode, drain electrode interconnection together, are connected to Differential Input, output port by external circuit.By this cross-linked mode, effectively suppress the high fdrequency component of circuit, improve the linearity, inhibit break-through, reduce noise.Meanwhile, the impact that the inconsistency of four field effect transistor causes also can weaken by this scheme.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 is the structural representation of the double balanced mixer based on graphene field effect pipe of one embodiment of the invention;
Fig. 2 is the artificial circuit figure of the double balanced mixer based on graphene field effect pipe of one embodiment of the invention;
Fig. 3 be one embodiment of the invention based on the double balanced mixer of graphene field effect pipe and the circuit diagram of peripheral circuit;
Fig. 4 is the test result schematic diagram of the double balanced mixer based on graphene field effect pipe of one embodiment of the invention;
Fig. 5 is the test result schematic diagram of the double balanced mixer based on graphene field effect pipe of another embodiment of the present invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance.
In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, concrete condition above-mentioned term concrete meaning in the present invention can be understood.
With reference to description below and accompanying drawing, these and other aspects of embodiments of the invention will be known.Describe at these and in accompanying drawing, specifically disclose some particular implementation in embodiments of the invention, representing some modes of the principle implementing embodiments of the invention, but should be appreciated that the scope of embodiments of the invention is not limited.On the contrary, embodiments of the invention comprise fall into attached claims spirit and intension within the scope of all changes, amendment and equivalent.
Below in conjunction with accompanying drawing, the double balanced mixer according to the graphene field effect pipe of the embodiment of the present invention is described.
Fig. 1 is the structural representation of the double balanced mixer based on graphene field effect pipe of one embodiment of the invention.Please refer to Fig. 1, the double balanced mixer of the graphene field effect pipe of embodiments of the invention, comprise the first graphene field effect pipe T1, the second graphene field effect pipe T2, the 3rd graphene field effect pipe T3 and the 4th graphene field effect pipe T4.
The grid of the first graphene field effect pipe T1 connects local oscillation signal positive input terminal LO
+, drain electrode connects radiofrequency signal negative input end RF
-, source electrode connects intermediate-freuqncy signal positive output end IF
+.
The grid of the second graphene field effect pipe T2 connects local oscillation signal positive input terminal LO
+, drain electrode connects radiofrequency signal positive input terminal RF
+, source electrode connects intermediate-freuqncy signal negative output terminal IF
-.
The grid of the 3rd graphene field effect pipe T3 connects local oscillation signal negative input end LO
-, drain electrode connects radiofrequency signal negative input end RF
-, source electrode connects intermediate-freuqncy signal negative output terminal IF
-.
The grid of the 4th graphene field effect pipe T4 connects local oscillation signal negative input end LO
-, drain electrode connects radiofrequency signal positive input terminal RF
+, source electrode connects intermediate-freuqncy signal positive output end IF
+.
Below with reference to emulation experiment, beneficial effect of the present invention is described.Please refer to Fig. 2, the parameter of the first graphene field effect pipe T1, the second graphene field effect pipe T2, the 3rd graphene field effect pipe T3 and the 4th graphene field effect pipe T4 is as following table:
Wherein, W represents channel width, and ro_0 represents the remaining carrier concentration of raceway groove, and it is long that l represents grid, and Tox represents gate oxide thickness, and Mu represents carrier mobility, and Vgs0 represents backgate dirac point voltage, and Rc0 represents source-drain contact resistance.
The present embodiment selects four identical graphene field effect pipes of parameter to detect the linearity.
Please refer to Fig. 3, illustrate according to the direction in figure based on the double balanced mixer of graphene field effect pipe and peripheral circuit below.Left side based on the double balanced mixer of graphene field effect pipe is radiofrequency signal input circuit, upside is differential signal input circuit, right side is mixed frequency signal output circuit.It should be noted that annexation that those skilled in the art are appreciated that in actual applications is not limited to the position relationship in " left side ", " right side " and " upside " described in figure.
Radiofrequency signal input circuit comprises radiofrequency signal input source PORT1 and the first Ba Lun RF, for providing radiofrequency signal.
Local oscillation signal input circuit comprises local oscillator input PORT2, the second Ba Lun CMP2, and is connected to the first graphene field effect pipe T1, the second graphene field effect pipe T2, the grid T3 of the 3rd graphene field effect pipe and the direct grid current offset signal SRC2 of the 4th graphene field effect pipe T4 simultaneously.Local oscillation signal input circuit is used for providing local frequency.
Intermediate-freuqncy signal output circuit comprises mixing Ba Lun CMP3, is connected to the DC bias signal SRC1 of the first graphene field effect pipe T1, the second graphene field effect pipe T2, the 3rd graphene field effect pipe T3 and the 4th graphene field effect pipe T4 drain terminal and mixed frequency signal output TERM simultaneously.Intermediate-freuqncy signal output circuit is for exporting mixed frequency signal.
Peripheral circuit parameter and computing formula are: IFfreq=RFfreq-LOfreq, and wherein IFfreq represents intermediate-freuqncy signal, and RFfreq represents radiofrequency signal, and LOfreq represents local oscillation signal.Pout (dBm)=Pin (dBm)+G (dB), Pout represents power output, and Pin represents input power, and G represents gain.OIP3=ip3_out (Vout ,-1,1,0} ,-1,2 ,-1}), wherein, OIP3 is third order intermodulation output point.Third order intermodulation output point, formula is the built-in computing formula of simulation software ADS.The computing formula of third order intermodulation input point IIP3 is: IIP3 (dBm)=OIP3 (dBm)-G (dB).
Please refer to Fig. 4, in an example of the present invention, based on the double balanced mixer of graphene field effect pipe 1dB compression point (solid line and theoretical value straight line differ RFpower corresponding to the point of 1dB), the larger expression linearity is better, and correspondence is about the position of-3dBm; The value of third order intermodulation point inputim3, larger expression higher order signal is more weak, and the linearity is better.Result is as follows:
| IF-FRE | Conversion gain | Third order intermodulation input point | Third order intermodulation output point |
| 100MHz | -36.412 | 7.774 | -28.638 |
Please refer to Fig. 5, in an example of the present invention, based on the double balanced mixer of graphene field effect pipe 1dB compression point (solid line and theoretical value straight line differ RFpower corresponding to the point of 1dB), the larger expression linearity is better, and correspondence is about the position of-3dBm; The value of third order intermodulation point inputim3, larger expression higher order signal is more weak, and the linearity is better.Result is as follows:
| IF-FRE | Conversion gain | Third order intermodulation input point | Third order intermodulation output point |
| 100MHz | -40.680 | 11.489 | -29.191 |
It can thus be appreciated that the double balanced mixer based on graphene field effect pipe of the embodiment of the present invention is compared with having the very high linearity in large bandwidth.
In addition, other formation of the double balanced mixer based on graphene field effect pipe of the embodiment of the present invention and effect are all known for a person skilled in the art, in order to reduce redundancy, do not repeat.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present invention and aim, scope of the present invention is by claim and equivalency thereof.
Claims (1)
1. based on a double balanced mixer for graphene field effect pipe, it is characterized in that, comprising:
First graphene field effect pipe, the grid of described first graphene field effect pipe connects local oscillation signal positive input terminal, the drain electrode of described first graphene field effect pipe connects radiofrequency signal negative input end, and the source electrode of described first graphene field effect pipe connects intermediate-freuqncy signal positive output end;
Second graphene field effect pipe, the grid of described second graphene field effect pipe connects described local oscillation signal positive input terminal, the drain electrode of described second graphene field effect pipe connects radiofrequency signal positive input terminal, and the source electrode of described first graphene field effect pipe connects intermediate-freuqncy signal negative output terminal;
3rd graphene field effect pipe, the grid of described 3rd graphene field effect pipe connects local oscillation signal negative input end, the drain electrode of described 3rd graphene field effect pipe connects described radiofrequency signal negative input end, and the source electrode of described 3rd graphene field effect pipe connects described intermediate-freuqncy signal negative output terminal; With
4th graphene field effect pipe, the grid of described 4th graphene field effect pipe connects described local oscillation signal negative input end, the drain electrode of described 4th graphene field effect pipe connects described radiofrequency signal positive input terminal, and the source electrode of described 4th graphene field effect pipe connects described intermediate-freuqncy signal positive output end.
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| CN201510924414.8A CN105391404B (en) | 2015-12-14 | 2015-12-14 | A kind of double balanced mixer based on graphene field effect pipe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110601660A (en) * | 2019-08-19 | 2019-12-20 | 成都理工大学 | Graphene down-conversion mixer based on direct current bias and design method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101944882A (en) * | 2010-08-24 | 2011-01-12 | 上海集成电路研发中心有限公司 | Mixer |
| US20140030992A1 (en) * | 2011-04-04 | 2014-01-30 | Telefonaktiebolaget L M Ericsson (Publ) | Mixer circuit |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101944882A (en) * | 2010-08-24 | 2011-01-12 | 上海集成电路研发中心有限公司 | Mixer |
| US20140030992A1 (en) * | 2011-04-04 | 2014-01-30 | Telefonaktiebolaget L M Ericsson (Publ) | Mixer circuit |
Non-Patent Citations (1)
| Title |
|---|
| HONGMING LYU等: "Double-Balanced Grapene Integrated Mixer with Outstanding Linearity", 《NANO LETTERS》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110601660A (en) * | 2019-08-19 | 2019-12-20 | 成都理工大学 | Graphene down-conversion mixer based on direct current bias and design method |
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