Power amplification circuit

Patent metadata

Field	Value
Publication number	US-10326419-B2
Application number	US-201815911606-A
Country	US
Kind code	B2
Filing date	Mar 5, 2018
Priority date	Mar 24, 2017
Publication date	Jun 18, 2019
Grant date	Jun 18, 2019

Abstract

A power amplification circuit includes a first transistor, which includes a source coupled to a first power supply and receives an input signal at a gate of the first transistor, a capacitor, which includes a first terminal and a second terminal, the first terminal being coupled to a drain of the first transistor, and a transformer, which is coupled between the second terminal and the gate of the first transistor, transforms a first signal input from the second terminal, and outputs a second signal having a phase different from a phase of the first signal to the gate of the first transistor. The first transistor outputs an output signal from the drain of the first transistor.

First claim

What is claimed is:

1. A power amplification circuit, comprising:
a first transistor that has a first source terminal coupled to a first power supply, a first gate terminal for receiving an input signal and a first drain terminal, the first transistor outputting a first output signal from the first drain terminal;
a capacitor that includes a first terminal and a second terminal, the first terminal being coupled to the first drain terminal; and
a transformer that is coupled between the second terminal and the first gate terminal, transforms a first signal input from the second terminal, and outputs a second signal having a phase different from a phase of the first signal to the first gate terminal,
wherein the transformer includes
a first inductor that includes a third terminal coupled to the second terminal and a fifth terminal coupled to a second power supply, and
a second inductor that includes a fourth terminal coupled to the first gate terminal and a sixth terminal coupled to a third power supply and performs magnetic-field coupling with the first inductor.

2. The power amplification circuit according to claim 1 ,
wherein an inductance value of the first inductor is approximately equal to an inductance value of the second inductor.

3. The power amplification circuit according to claim 1 ,
wherein the capacitor has a capacitance value determined according to an inductance value of the first inductor, an inductance value of the second inductor, a coupling coefficient of the transformer, and a capacitance value of parasitic capacitance between the first gate terminal and the first drain terminal.

4. The power amplification circuit according to claim 1 , comprising:
a resistor that is provided between the second terminal and the second power supply and coupled in series to the first inductor.

5. The power amplification circuit according to claim 1 , comprising:
a second transistor that has a second source terminal coupled to the first drain terminal, a second gate terminal coupled to a fourth power supply and a second drain terminal outputting a second output signal.

Assignees

• Panasonic Corp

Inventors

• Abe Takayuki

Classifications

• H03F1/347 Primary

  using transformers · CPC title

• H03F2203/45394

  the AAC of the dif amp comprising FETs whose sources are not coupled, i.e. the AAC being a pseudo-differential amplifier · CPC title

• H03F3/45264 Primary

  Complementary cross coupled types · CPC title

• H03F2203/45318

  the AAC comprising a cross coupling circuit, e.g. two extra transistors cross coupled · CPC title

• H03F3/195

  in integrated circuits · CPC title