Passive transconductance enhancement differential amplification circuit

Abstract

This invention discloses a passive transconductance enhancement differential amplifier circuit, comprising: an input signal enhancement, matching, and biasing network for enhancing the RF input signal, impedance matching of the input module, and DC biasing; an input module for initially amplifying the RF signal output by the input signal enhancement, matching, and biasing network; an interstage matching and biasing network for interstage matching between the input module and the output module; an output module for further amplifying the RF signal after initial amplification by the input module; and an output matching and biasing network for output impedance matching and DC biasing of the output module.

Description

Technical Field

[0001] This invention relates to the field of radio frequency front-end integrated circuit technology, and in particular to a passive transconductance enhancement differential amplifier circuit. Background Technology

[0002] like Figure 1 As shown, a conventional two-stage cascaded differential amplifier RF front-end circuit includes an input matching and biasing network 10, an input module 20, an inter-stage matching and biasing network 30, an output module 40, and an output matching and biasing network 50.

[0003] The input and matching and biasing network 10 consists of a first input capacitor C1, a second input capacitor C2, and a source feedback inductor L. s Matching inductor L with gate resonant g Composed of components, it is used to complete signal amplification of RF input signals RFin+ and RFin-, impedance matching and DC bias of input module 20; input module 20 is a differential input stage used to complete the initial amplification of RF signals; inter-stage matching and biasing network 30 consists of the first drain inductor L d1 Interstage capacitor C3, interstage capacitor C4, first bias resistor R 1i Second bias resistor R 2i The system comprises two stages: input module 20 and output module 40, used for inter-stage matching (i.e., matching of input and output impedances) and DC biasing; output module 40 is a differential output stage used for further amplification of the RF signal; the output matching and biasing network 50 consists of a second drain inductor L. d2 The output module 40 consists of a first output capacitor C5 and a second output capacitor C6, used to complete the output impedance matching and DC bias of the output module 40. In the prior art, the source feedback inductor L... s Matching inductor L with gate resonant g Independent setup, easy to debug.

[0004] To improve communication data transmission rates and increase the number of channels, bandwidth is often increased, frequencies are raised, or even millimeter-wave communication is employed. However, as the frequency increases, transmission losses in high-frequency signal environments increase, and the intrinsic gain of a single stage in silicon-based devices decreases with increasing frequency. Therefore, high-frequency and millimeter-wave low-noise amplifier circuits often employ multi-stage structures, requiring design improvements in low power consumption and gain enhancement. Summary of the Invention

[0005] To overcome the shortcomings of the existing technology, the present invention aims to provide a passive transconductance-enhanced differential amplifier circuit. It utilizes the differential input feedback inductor and the resonant matching inductor to form a transformer through cross-electromagnetic passive coupling, thereby increasing the amplitude of the input effective voltage signal and enhancing the equivalent transconductance. This improves the gain without increasing the area and power consumption. At the same time, the multiplexing of the input and output stage bias currents can save power consumption, thus achieving low cost, low power consumption and high gain performance.

[0006] To achieve the above and other objectives, the present invention proposes a passive transconductance-enhanced differential amplifier circuit, comprising:

[0007] The input signal enhancement, matching, and biasing network is used to perform signal enhancement of the RF input signal, impedance matching of the input module, and DC biasing.

[0008] The input module is used to perform preliminary amplification of the radio frequency signal output by the input signal enhancement and matching and biasing network.

[0009] Inter-level matching and biasing network is used to complete inter-level matching between the input module and the output module.

[0010] The output module is used to further amplify the radio frequency signal after it has been initially amplified by the input module;

[0011] The output matching and biasing network is used to complete the output impedance matching and DC biasing of the output module.

[0012] Preferably, the input signal enhancement, matching, and biasing network utilizes a differential input source feedback inductor (L... s ) and the first gate resonant matching inductor (L g Cross-electromagnetic passive coupling forms a transformer, which increases the amplitude of the radio frequency input signal by (1+k1) times and enhances the equivalent transconductance by k1 times.

[0013] Preferably, the input signal enhancement, matching, and biasing network includes a first input capacitor (C1), a second input capacitor (C2), and a cross-electromagnetically passively coupled source feedback inductor (L). s ) and the first gate resonant matching inductor (L g The first radio frequency input signal (RFin+) is connected to one end of the first input capacitor (C1), and the other end of the first input capacitor (C1) is connected to the input module and the first gate resonant matching inductor (L). g The second RF input signal (RFin-) is connected to one end of the second input capacitor (C2), and the other end of the second input capacitor (C2) is connected to the input module and the first gate resonant matching inductor (L). g The opposite terminal of ) and the first gate resonant matching inductor (L) gThe center tap of the gate is connected to the first gate bias voltage (V). g1 ), first gate resonant matching inductor (L g ) and source feedback inductor (L s Cross-electromagnetic passive coupling forms a transformer with a coupling coefficient of k1.

[0014] Preferably, the input module is a differential input stage, with its non-inverting input terminal connected to the first input capacitor (C1) and its inverting input terminal connected to the second input capacitor (C2). The source feedback terminal (DC-) of the inverting amplifier circuit of the input module is connected to the source feedback inductor (L). s The same-named terminals of the circuit are connected, and the source feedback terminal (DC+) of its non-inverting amplifier circuit is connected to the source feedback inductor (L). s Connect the opposite ends of ).

[0015] Preferably, the interstage matching and biasing network includes a first drain inductor (L... d1 ), first interstage capacitor (C3), second interstage capacitor (C4), first bias resistor (R) 1i ) and second bias resistor (R 2i The non-inverting output terminal of the input module's non-inverting amplifier circuit is connected to the first drain inductor (L). d1 One end of the input module is connected to one end of the first stage capacitor (C3), and the inverting output terminal of the inverting amplifier circuit is connected to the first drain inductor (L). d1 The other end of the first drain inductor (L) and the first end of the second stage capacitor (C4) are connected. d1 The middle tap of the first stage capacitor (C3) is connected to the power supply voltage (Vdd), and the other end of the first stage capacitor (C3) is connected to the output module and the first bias resistor (R). 1i One end of the second interstage capacitor (C4) is connected to the output module, and the other end of the second interstage capacitor (C4) is connected to the second bias resistor (R). 2i One end of the first bias resistor (R) 1i The other end of the resistor is connected to the second bias resistor (R). 2i The other end is connected to and connected to the second gate bias voltage (V). g2 ).

[0016] Preferably, the output module is a differential output stage, with its non-inverting input terminal connected to the first interstage capacitor (C3) and its inverting input terminal connected to the second interstage capacitor (C4). The non-inverting output terminal of its non-inverting amplifier circuit and the inverting output terminal of its inverting amplifier circuit are connected to the output matching and biasing network. The first bias terminal (DC-) of the source of the inverting amplifier circuit and the second bias terminal (DC+) of the source of the non-inverting amplifier circuit are grounded.

[0017] Preferably, the output matching and biasing network includes a second drain inductor (L... d2The output module has a first output capacitor (C5), a second output capacitor (C6), and the non-inverting output terminal of the non-inverting amplifier circuit is connected to the second drain inductor (L). d2 One end of the input module is connected to one end of the first output capacitor (C5), and the inverting output terminal of the inverting amplifier circuit of the input module is connected to the second drain inductor (L). d2 The other end of the second output capacitor (C6) and the other end of the second drain inductor (L) d2 The middle tap of the first output capacitor (C5) is connected to the power supply voltage (Vdd). The other end of the first output capacitor (C5) is the non-inverting input (RFout+) of the RF output signal, and the other end of the second output capacitor (C6) is the inverting input (RFout-) of the RF output signal.

[0018] Preferably, the output module includes a differential output stage, a cross-coupled circuit, and a bias ground capacitor (C). gnd The source first bias terminal (DC-) of the inverting amplifier circuit of the output module is connected to the source second bias terminal (DC+) of the non-inverting amplifier circuit and connected to the bias ground capacitor (C). gnd One end of the ) and the first drain inductor (L) of the interstage matching and biasing network d1 The center tap of the bias grounding capacitor (C) gnd The other end of the output module is grounded, and the non-inverting output terminal of the output module is also connected to the first cross-coupling capacitor (C) of the cross-coupling circuit. 1i The non-inverting output terminal of the non-inverting amplifier circuit connected to the input module, and the first drain inductor (L) d1 One end of the first stage capacitor (C3) and one end of the first stage capacitor (C3), the inverting output terminal of the output module is also connected to the second cross-coupling capacitor (C) of the cross-coupling circuit. 2i The inverting output terminal of the inverting amplifier circuit connected to the input module, and the first drain inductor (L) d1 The other end of the capacitor and one end of the first interstage capacitor (C4).

[0019] Preferably, the interstage matching and biasing network includes interstage bias resistors (Ri). i ) and interstage bias decoupling capacitor (C i The first drain inductance (L) coupled to the transformer d1 ) and the second gate resonant matching inductor (L g2 The non-inverting output terminal of the input module's non-inverting amplifier circuit is connected to the first drain inductor (L). d1 The inverting output terminal of the inverting amplifier circuit of the input module is connected to the first drain inductor (L). d1 The opposite terminal of the first drain inductor (L) d1 The center tap of the second gate resonant matching inductor (L) is connected to the output module.g2 The same-named terminal is connected to the non-inverting input terminal of the output module, and the second gate resonant matching inductor (L) g2 The opposite terminal is connected to the inverting input terminal of the output module, and the second gate resonant matching inductor (L) g2 The center tap of the circuit is connected to the interstage bias resistor (R). i One end of the stage and the interstage bias decoupling capacitor (C) i One end of the stage, the interstage bias resistor (R) i The other end of the stage and the interstage bias decoupling capacitor (C) i The other end is connected to the second gate bias voltage (V). g2 ).

[0020] Preferably, the output module includes a differential output stage, a cross-coupled circuit, and a bias ground capacitor (C). gnd The source first bias terminal (DC-) of the inverting amplifier circuit of the output module is connected to the source second bias terminal (DC+) of the non-inverting amplifier circuit and connected to the bias ground capacitor (C). gnd One end of the first drain inductor (L) and the first drain inductor (L) d1 The center tap of the bias grounding capacitor (C) gnd The other end of the output module is grounded; the non-inverting output terminal of the output module is also connected to the first cross-coupling capacitor (C) of the cross-coupling circuit. 1i The non-inverting output terminal of the non-inverting amplifier circuit connected to the input module, and the first drain inductor (L) d1 One end of the first stage capacitor (C3) and one end of the first stage capacitor (C3), the inverting output terminal of the output module is connected to the second cross-coupling capacitor (C) of the cross-coupling circuit. 2i The inverting output terminal of the inverting amplifier circuit connected to the input module, and the first drain inductor (L) d1 The other end of the capacitor and one end of the first interstage capacitor (C4).

[0021] Compared with the prior art, the passive transconductance enhancement differential amplifier circuit of the present invention utilizes the differential input feedback inductor and the resonant matching inductor to form a transformer through cross-electromagnetic passive coupling, thereby increasing the amplitude of the input effective voltage signal and enhancing the equivalent transconductance. This improves the gain without increasing the area and power consumption. At the same time, the multiplexing of the input and output stage bias currents can save power consumption, thus achieving low cost, low power consumption and high gain performance. Attached Figure Description

[0022] Figure 1 This is a circuit diagram of a traditional two-stage cascaded differential amplifier RF front-end circuit.

[0023] Figure 2 This is a schematic diagram of the circuit structure of a passive transconductance-enhanced differential amplifier circuit according to an exemplary embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the circuit structure of a passive transconductance-enhanced differential amplifier circuit according to another exemplary embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the circuit structure of a passive transconductance-enhanced differential amplifier circuit in another exemplary embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram comparing the gains of the present invention with those of existing technologies. Detailed Implementation

[0027] The following describes the embodiments of the present invention through specific examples and in conjunction with the accompanying drawings. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific examples, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0028] Figure 2 This is a schematic diagram of the circuit structure of a passive transconductance-enhanced differential amplifier circuit according to an exemplary embodiment of the present invention. Figure 2 As shown, the present invention provides a passive transconductance enhancement differential amplifier circuit, including an input signal enhancement, matching and biasing network 10, an input module 20, an interstage matching and biasing network 30, an output module 40 and an output matching and biasing network 50.

[0029] The input signal enhancement, matching, and biasing network 10 consists of a first input capacitor C1, a second input capacitor C2, and a source feedback inductor L with cross-electromagnetic passive coupling. s and the first gate resonant matching inductor L g Composed of components, it is used to complete signal amplification of RF input signals RFin+ and RFin-, impedance matching and DC bias of input module 20; input module 20 is a differential input stage used to complete the initial amplification of RF signals; inter-stage matching and biasing network 30 consists of the first drain inductor L d1 Interstage capacitor C3, interstage capacitor C4, first bias resistor R 1i Second bias resistor R 2i The system comprises two stages: input module 20 and output module 40, used for inter-stage matching (i.e., matching of input and output impedances) and DC biasing; output module 40 is a differential output stage used for further amplification of the RF signal; the output matching and biasing network 50 consists of a second drain inductor L. d2 It consists of a first output capacitor C5 and a second output capacitor C6, which are used to complete the output impedance matching and DC bias of the output module 40.

[0030] The RF input signal RFin+ is connected to one end of the first input capacitor C1, and the other end of the first input capacitor C1 is connected to the non-inverting input terminal of the input module 20 and the first gate resonant matching inductor L. g The RF input signal RFin- is connected to one end of the second input capacitor C2, and the other end of the second input capacitor C2 is connected to the inverting input terminal of the input module 20 and the first gate resonant matching inductor L. g The opposite terminal, the first gate resonant matching inductor L g The center tap is connected to the first gate bias voltage V. g1 The source feedback terminal DC- of the inverting amplifier circuit of input module 20 is connected to the source feedback inductor L. s The source feedback terminal DC+ of the non-inverting amplifier circuit of input module 20 is connected to the source feedback inductor L. s The opposite terminals are connected, and the source feedback inductor L s The center tap is grounded; the first gate resonant matching inductor L g With source feedback inductor L s Cross-electromagnetic passive coupling forms a transformer with a coupling coefficient of k1;

[0031] The non-inverting output terminal of the input module 20's non-inverting amplifier circuit is connected to the first drain inductor L. d1 One end of the input module 20 is connected to one end of the first stage interstage capacitor C3, and the inverting output terminal of the inverting amplifier circuit is connected to the first drain inductor L. d1 The other end and one end of the interstage capacitor C4, the first drain inductor L d1 The center tap is connected to the power supply voltage Vdd, and the other end of the first interstage capacitor C3 is connected to the non-inverting input terminal of the output module 40 and the first bias resistor R. 1i One end of the second interstage capacitor C4 is connected to the inverting input terminal of the output module 40 and the second bias resistor R. 2i One end, the first bias resistor R 1i The other end is connected to the second bias resistor R 2i The other end is connected to and connected to the second gate bias voltage V. g2 ;

[0032] The non-inverting output terminal of the non-inverting amplifier circuit of output module 40 is connected to the second drain inductor L. d2 One end of the input module 40 and one end of the first output capacitor C5 are connected to the inverting output terminal of the inverting amplifier circuit, which is connected to the second drain inductor L. d2 The other end and one end of the second output capacitor C6, the second drain inductor L d2The middle tap is connected to the power supply voltage Vdd. The first bias terminal DC- of the source of the inverting amplifier circuit of the output module 40 and the second bias terminal DC+ of the source of the non-inverting amplifier circuit are grounded. The other end of the first output capacitor C5 is the non-inverting terminal RFout+ of the RF output signal, and the other end of the second output capacitor C6 is the inverting terminal RFout- of the RF output signal.

[0033] This invention utilizes a differential input source feedback inductor L s and the first gate resonant matching inductor L g The passive electromagnetic coupling of the present invention forms a transformer, which increases the amplitude of the input effective voltage signal by (1+k1) times, the equivalent transconductance is enhanced by k1 times, and the theoretical gain is increased by 6dB. The passive transconductance enhancement method of the present invention does not require additional active devices or additional DC power consumption, nor does it increase additional noise, and can improve the gain-power-efficiency ratio. The present invention does not require additional inductors or components, does not increase the area, and the transformer coupling method realizes the input signal enhancement and matching and biasing network, which saves area to a certain extent and can reduce costs, thus achieving low cost, low power consumption and high gain performance.

[0034] Figure 3 This is a schematic diagram of the circuit structure of a passive transconductance-enhanced differential amplifier circuit according to another exemplary embodiment of the present invention. In this embodiment, the output module 40 consists of a differential output stage 401, a cross-coupling circuit 402, and a bias grounding capacitor C. gnd Composed of components used to perform cross-coupling and current multiplexing of radio frequency signals, the cross-coupling circuit 402 includes a first cross-coupling capacitor C. 1i Second cross-coupling capacitor C 2i .

[0035] exist Figure 2 Based on this, some connection lines of the interstage matching and bias network 30 and the output module 40 are changed to achieve new functions. The source first bias terminal DC- of the inverting amplifier circuit of the output module 40 is connected to the source second bias terminal DC+ of the non-inverting amplifier circuit and connected to the bias ground capacitor C. gnd One end and the first drain inductance L d1 The center tap, bias grounding capacitor C gnd The other end is grounded; the non-inverting output terminal of the output module 40 is also connected to the first cross-coupling capacitor C of the cross-coupling circuit 402. 1i The non-inverting output terminal of the non-inverting amplifier circuit connected to the input module 20, and the first drain inductor L d1 One end of the output module 40 and one end of the first stage interstage capacitor C3, the inverting output terminal of the output module 40 is also connected to the second cross-coupling capacitor C of the cross-coupling circuit 402. 2i The inverting output terminal of the inverting amplifier circuit connected to the input module 20, and the first drain inductor L d1The other end and one end of the first stage interstage capacitor C4.

[0036] In this embodiment, the output terminals of the differential input stage and the differential output stage are coupled by capacitors to achieve multi-signal link output, which enhances the transconductance of the equivalent output stage to a certain extent and further improves the output gain. The differential input stage and the differential output stage share the DC bias current, and the power consumption current reuse can save circuit power consumption.

[0037] Figure 4 This is a schematic diagram of the circuit structure of a passive transconductance-enhanced differential amplifier circuit in another exemplary embodiment of the present invention. Figure 4 As shown, the interstage matching and biasing network 30 consists of interstage biasing resistors R i Interstage bias decoupling capacitor C i The first drain inductance L coupled to the transformer d1 Matching inductor L with the second gate resonant g2 The system comprises a differential output stage 401, a cross-coupling circuit 402, and a bias grounding capacitor C. It is used to achieve inter-stage matching between the input module 20 and the output module 40, i.e., matching the input and output impedances and DC biasing. Transformer coupling and RC phase adjustment are used to improve signal coupling, differential phase synchronization, and reverse isolation. The output module 40 consists of a differential output stage 401, a cross-coupling circuit 402, and a bias grounding capacitor C. gnd Composed of components used to perform cross-coupling and current multiplexing of radio frequency signals, the cross-coupling circuit 402 includes a first cross-coupling capacitor C. 1i Second cross-coupling capacitor C 2i .

[0038] exist Figure 2 Based on this, some connection lines of the inter-stage matching and bias network 30 and the output module 40 are changed to achieve new functions.

[0039] The non-inverting output terminal of the input module 20's non-inverting amplifier circuit is connected to the first drain inductor L. d1 The inverting output terminal of the inverting amplifier circuit of input module 20 is connected to the first drain inductor L. d1 The opposite terminal, the first drain inductor L d1 The center tap is connected to the first bias terminal DC- of the source of the inverting amplifier circuit of the output module 40, the second bias terminal DC+ of the source of the non-inverting amplifier circuit, and the bias ground capacitor C. gnd At one end, the second gate resonant matching inductor L g2 The same-name terminal is connected to the non-inverting input terminal of the output module 40, and the second gate resonant matching inductor L g2 The opposite-named terminal is connected to the inverting input terminal of the output module 40, and the second gate resonant matching inductor L g2 The center tap is connected to the interstage bias resistor R. i One end and interstage bias decoupling capacitor Ci One end, interstage bias resistor R i The other end and the interstage bias decoupling capacitor C i The other end is connected to the second gate bias voltage V. g2 ;

[0040] The source first bias terminal DC- of the inverting amplifier circuit of output module 40 is connected to the source second bias terminal DC+ of the non-inverting amplifier circuit and then connected to the bias ground capacitor C. gnd One end and the first drain inductance L d1 The center tap, bias grounding capacitor C gnd The other end is grounded; the non-inverting output terminal of the output module 40 is also connected to the first cross-coupling capacitor C of the cross-coupling circuit 402. 1i The non-inverting output terminal of the non-inverting amplifier circuit connected to the input module 20, and the first drain inductor L d1 One end of the output module 40 and one end of the first stage interstage capacitor C3, the inverting output terminal of the output module 40 is also connected to the second cross-coupling capacitor C of the cross-coupling circuit 402. 2i The inverting output terminal of the inverting amplifier circuit connected to the input module 20, and the first drain inductor L d1 The other end and one end of the first stage interstage capacitor C4.

[0041] As can be seen, in this embodiment, the input stage and output stage are coupled by transformer coupling and RC phase flattening adjustment to achieve inter-stage matching. The stage bias network improves signal coupling differential phase synchronization and reverse isolation.

[0042] like Figure 5 As shown in the figure, the lower curve "typical" is the gain-frequency curve of the prior art, and the upper curve "Novel" is the gain-frequency curve of the present invention. By comparison, it can be seen that the novel passive transconductance-enhanced current-multiplexed differential amplifier circuit achieves a transconductance enhancement gain improvement of 5.5dB without increasing power consumption.

[0043] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can make modifications and changes to the above embodiments without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention should be as set forth in the claims.

Claims

1. A passive transconductance-enhanced differential amplifier circuit, comprising: An input signal enhancement, matching, and biasing network is used to perform signal enhancement of the RF input signal, impedance matching of the input module, and DC biasing. The input signal enhancement, matching, and biasing network includes a first input capacitor (C1), a second input capacitor (C2), and a cross-electromagnetically passively coupled source feedback inductor (L). s ) and the first gate resonant matching inductor (L g The first radio frequency input signal (RFin+) is connected to one end of the first input capacitor (C1), and the other end of the first input capacitor (C1) is connected to the input module and the first gate resonant matching inductor (L). g The second RF input signal (RFin-) is connected to one end of the second input capacitor (C2), and the other end of the second input capacitor (C2) is connected to the input module and the first gate resonant matching inductor (L). g The opposite terminal of ) and the first gate resonant matching inductor (L) g The center tap of the gate is connected to the first gate bias voltage (V). g1 ), first gate resonant matching inductor (L g ) and source feedback inductor (L s Cross-electromagnetic passive coupling forms a transformer with a coupling coefficient of k1, which increases the amplitude of the radio frequency input signal by (1+k1) times and enhances the equivalent transconductance by k1 times. The input module is used to perform preliminary amplification of the radio frequency signal output by the input signal enhancement and matching and biasing network. Inter-level matching and biasing network is used to complete inter-level matching between the input module and the output module. The output module is used to further amplify the radio frequency signal after it has been initially amplified by the input module; The output matching and biasing network is used to complete the output impedance matching and DC biasing of the output module.

2. The passive transconductance-enhanced differential amplifier circuit as described in claim 1, characterized in that, The input module is a differential input stage, with its non-inverting input terminal connected to the first input capacitor (C1) and its inverting input terminal connected to the second input capacitor (C2). The source feedback terminal (DC-) of the inverting amplifier circuit of the input module is connected to the source feedback inductor (L). s The same-named terminals of the circuit are connected, and the source feedback terminal (DC+) of its non-inverting amplifier circuit is connected to the source feedback inductor (L). s Connect the opposite ends of ).

3. The passive transconductance-enhanced differential amplifier circuit as described in claim 2, characterized in that, The interstage matching and biasing network includes a first drain inductor (L d1 First interstage capacitor (C3), second interstage capacitor (C4), first bias resistor (R) 1i ) and second bias resistor (R 2i The non-inverting output terminal of the input module's non-inverting amplifier circuit is connected to the first drain inductor (L). d1 One end of the input module is connected to one end of the first stage capacitor (C3), and the inverting output terminal of the inverting amplifier circuit is connected to the first drain inductor (L). d1 The other end of the first drain inductor (L) and the other end of the second stage capacitor (C4) are connected. d1 The center tap of the capacitor is connected to the power supply voltage (Vdd), and the other end of the first interstage capacitor (C3) is connected to the output module and the first bias resistor (R). 1i One end of the second interstage capacitor (C4) is connected to the output module, and the other end of the second interstage capacitor (C4) is connected to the second bias resistor (R). 2i One end of the first bias resistor (R) 1i The other end of the resistor is connected to the second bias resistor (R). 2i The other end is connected to and connected to the second gate bias voltage (V). g2 ).

4. The passive transconductance-enhanced differential amplifier circuit as described in claim 3, characterized in that, The output module is a differential output stage. Its non-inverting input terminal is connected to the first interstage capacitor (C3), and its inverting input terminal is connected to the second interstage capacitor (C4). The non-inverting output terminal of its non-inverting amplifier circuit and the inverting output terminal of its inverting amplifier circuit are connected to the output matching and biasing network. The first bias terminal (DC-) of the source of the inverting amplifier circuit and the second bias terminal (DC+) of the source of the non-inverting amplifier circuit are grounded.

5. The passive transconductance-enhanced differential amplifier circuit as described in claim 4, characterized in that: The output matching and biasing network includes a second drain inductor (L d2 The output module has a first output capacitor (C5), a second output capacitor (C6), and the non-inverting output terminal of the non-inverting amplifier circuit is connected to the second drain inductor (L). d2 One end of the input module is connected to one end of the first output capacitor (C5), and the inverting output terminal of the inverting amplifier circuit of the input module is connected to the second drain inductor (L). d2 The other end of the second output capacitor (C6), one end of the second drain inductor (L) d2 The middle tap of the first output capacitor (C5) is connected to the power supply voltage (Vdd). The other end of the first output capacitor (C5) is the non-inverting input (RFout+) of the RF output signal, and the other end of the second output capacitor (C6) is the inverting input (RFout-) of the RF output signal.

6. The passive transconductance-enhanced differential amplifier circuit as described in claim 3, characterized in that: The output module includes a differential output stage, a cross-coupling circuit, and a bias grounding capacitor (C). gnd The source first bias terminal (DC-) of the inverting amplifier circuit of the output module is connected to the source second bias terminal (DC+) of the non-inverting amplifier circuit and connected to the bias ground capacitor (C). gnd One end of the ) and the first drain inductor (L) of the interstage matching and biasing network d1 The center tap of the bias grounding capacitor (C) gnd The other end of the output module is grounded, and the non-inverting output terminal of the output module is also connected to the first cross-coupling capacitor (C) of the cross-coupling circuit. 1i ) connected to the non-inverting output terminal of the non-inverting amplifier circuit of the input module, and the first drain inductor (L d1 One end of the first stage capacitor (C3) and one end of the first stage capacitor (C3), the inverting output terminal of the output module is also connected to the second cross-coupling capacitor (C) of the cross-coupling circuit. 2i The inverting output terminal of the inverting amplifier circuit connected to the input module, and the first drain inductor (L) d1 The other end of the capacitor and one end of the first interstage capacitor (C4).

7. The passive transconductance-enhanced differential amplifier circuit as described in claim 2, characterized in that: The interstage matching and biasing network includes interstage bias resistors (R). i ) and interstage bias decoupling capacitor (C i The first drain inductance (L) coupled to the transformer d1 ) and the second gate resonant matching inductor (L g2 The non-inverting output terminal of the input module's non-inverting amplifier circuit is connected to the first drain inductor (L). d1 The inverting output terminal of the inverting amplifier circuit of the input module is connected to the first drain inductor (L). d1 The opposite terminal of the first drain inductor (L) d1 The center tap of the second gate resonant matching inductor (L) is connected to the output module. g2 The same-named terminal is connected to the non-inverting input terminal of the output module, and the second gate resonant matching inductor (L) g2 The opposite terminal is connected to the inverting input terminal of the output module, and the second gate resonant matching inductor (L) g2 The center tap of the circuit is connected to the interstage bias resistor (R). i One end of the stage and the interstage bias decoupling capacitor (C) i One end of the stage, the interstage bias resistor (R) i The other end of the stage and the interstage bias decoupling capacitor (C) i The other end is connected to the second gate bias voltage (V). g2 ).

8. The passive transconductance-enhanced differential amplifier circuit as described in claim 7, characterized in that: The output module includes a differential output stage, a cross-coupling circuit, and a bias grounding capacitor (C). gnd The source first bias terminal (DC-) of the inverting amplifier circuit of the output module is connected to the source second bias terminal (DC+) of the non-inverting amplifier circuit and connected to the bias ground capacitor (C). gnd One end of the first drain inductor (L) and the first drain inductor (L) d1 The center tap of the bias grounding capacitor (C) gnd The other end of the output module is grounded; the non-inverting output terminal of the output module is also connected to the first cross-coupling capacitor (C) of the cross-coupling circuit. 1i The non-inverting output terminal of the non-inverting amplifier circuit connected to the input module, and the first drain inductor (L) d1 One end of the first stage capacitor (C3) and one end of the first stage capacitor (C3), the inverting output terminal of the output module is connected to the second cross-coupling capacitor (C) of the cross-coupling circuit. 2i The inverting output terminal of the inverting amplifier circuit connected to the input module, and the first drain inductor (L) d1 The other end of the capacitor and one end of the first interstage capacitor (C4).

Images