Amplifier with high gain and linearity

Abstract

This disclosure discloses an amplifier comprising an input circuit, a coupling circuit, an amplification circuit, and a gain linearization enhancement circuit. The input circuit has a first transistor; the coupling circuit is coupled to the input circuit and has a coupling capacitor, a first coupling inductor, and a second coupling inductor. The coupling capacitor is coupled between the gate of the first transistor and the first coupling inductor, and the second coupling inductor is coupled to the drain of the first transistor; the amplification circuit is coupled to both the input circuit and the coupling circuit; the gain linearization enhancement circuit is coupled to the amplification circuit and has a second transistor and a first circuit inductor. The gate of the second transistor is coupled to the amplification circuit, and the drain of the second transistor is coupled to the first circuit inductor. This achieves high gain and improved linearity.

Claims

1. An amplifier with high gain and linearity, comprising: An input circuit having a first transistor; A coupling circuit coupled to the input circuit, the coupling circuit having a coupling capacitor, a first coupling inductor and a second coupling inductor, one end of the coupling capacitor being coupled to the gate of the first transistor, the other end of the coupling capacitor being coupled to one end of the first coupling inductor, and one end of the second coupling inductor being coupled to the drain of the first transistor; an amplifier circuit coupled to the input circuit and the coupling circuit; and a gain linear enhancement circuit coupled to the amplifier circuit; wherein the amplifier circuit has a fourth transistor, a second circuit capacitor, a second source inductor, a third base resistor and a third gate resistor, the second circuit capacitor being coupled to the drain of the fourth transistor, one end of the second source inductor being coupled to the source of the fourth transistor, the third base resistor being coupled between the base of the fourth transistor and one end of the third gate resistor, and the other end of the third gate resistor being coupled to the gate of the fourth transistor.

2. The amplifier with high gain and linearity as described in claim 1, wherein, The input circuit has a first source inductor and a first base resistor. One end of the first source inductor is coupled to the source terminal of the first transistor, and one end of the first base resistor is coupled to the base terminal of the first transistor.

3. An amplifier with high gain and linearity as described in claim 2, wherein, The input circuit has a first gate inductor, a first gate resistor and a first bypass capacitor. The first gate inductor is coupled between the gate terminal of the first transistor and one end of the first gate resistor, and the other end of the first gate resistor is coupled to one end of the first bypass capacitor.

4. An amplifier with high gain and linearity as described in claim 1, wherein, The amplifier circuit has a third transistor and a second base resistor, one end of which is coupled to the base terminal of the third transistor.

5. An amplifier with high gain and linearity as described in claim 4, wherein, The amplifier circuit has a first circuit capacitor, a second circuit inductor, a second gate resistor, and a second bypass capacitor. The first circuit capacitor is coupled between the drain terminal of the first transistor and one end of the second circuit inductor. The other end of the second circuit inductor is coupled between the gate terminal of the third transistor and one end of the second gate resistor. The other end of the second gate resistor is coupled to one end of the second bypass capacitor.

6. An amplifier with high gain and linearity as described in claim 5, wherein, The gain linear enhancement circuit further includes a second transistor and a first circuit inductor. The gate of the second transistor is coupled to the amplifier circuit, the drain of the second transistor is coupled to one end of the first circuit inductor, the second circuit capacitor is coupled between the gate of the second transistor and the drain of the fourth transistor, and the drain of the third transistor is coupled to the gate of the second transistor.

7. An amplifier with high gain and linearity as described in claim 6, wherein, It further includes an output circuit coupled to the amplifier circuit and the gain linear enhancement circuit. The output circuit has a fifth transistor and a fourth base resistor. The drain terminal of the fifth transistor is coupled to the other end of the first circuit inductor. The fourth base resistor is coupled to the base terminal of the fifth transistor. The amplifier circuit has a third circuit inductor coupled between the source terminal of the fifth transistor and the gate terminal of the second transistor.

8. An amplifier with high gain and linearity as described in claim 7, wherein, The output circuit has a third circuit capacitor, a fourth circuit inductor, a second gate inductor, and a feedback resistor. The third circuit capacitor and the fourth circuit inductor are connected in series. The third circuit capacitor and the fourth circuit inductor are coupled between one end of the second gate inductor and the gate terminal of the second transistor. The other end of the second gate inductor is coupled to the gate terminal of the fifth transistor. The feedback resistor is coupled between one end of the second gate inductor and the other end of the first circuit inductor.

9. An amplifier with high gain and linearity as described in claim 8, wherein, The output circuit has a sixth transistor, a fifth base resistor and a fourth gate resistor. The source terminal of the sixth transistor is coupled to the source terminal of the fifth transistor. The fifth base resistor is coupled between the base terminal of the sixth transistor and one end of the fourth gate resistor. The other end of the fourth gate resistor is coupled to the gate terminal of the sixth transistor.

10. An amplifier with high gain and linearity as described in claim 9, wherein, The drain terminal of the sixth transistor is coupled to the other end of the first circuit inductor.

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