Multi-finger transistor and power amplifier circuit

Abstract

The invention provides a multi-finger transistor and a power amplifier circuit, which enable a plurality of unit transistors to operate uniformly. The present invention includes: a plurality of unit transistors each including a first terminal electrically connected to a reference potential, a second terminal to which a high-frequency signal and a bias current are input, and a third terminal to which an amplified signal obtained by amplifying the high-frequency signal is output; a common input terminal which electrically connects the second terminals of the plurality of unit transistors in parallel and to which a high-frequency signal is input; a common bias terminal which electrically connects the second terminals of the plurality of unit transistors in parallel and to which a bias current is input; a common output terminal which electrically connects the third terminals of the plurality of unit transistors in parallel and outputs an amplified signal; and a plurality of first resistance elements which are electrically connected between the second terminals of the plurality of unit transistors and the common input terminal, respectively, and which cut off the DC component of the bias current.

Description

technical field [0001] The invention relates to a multi-finger transistor and a power amplifier circuit. Background technique [0002] Patent Document 1 describes a power amplifier module using transistors. In Patent Document 1, an AC signal is input to the base of the transistor without passing through a DC cutoff capacitor. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: International Publication No. 2015 / 001851 [0006] In an amplifier circuit, multi-finger transistors in which a plurality of unit transistors (also referred to as fingers) are electrically connected in parallel may be used. A unit transistor refers to a minimum structure constituting a transistor. In addition, the multi-finger transistor in the present disclosure is defined as connecting a plurality of unit transistors in parallel to function as one transistor circuit, and the number of emitters is plural. [0007] If the bases of a plurality of unit transistors ar...

AI Technical Summary

Problems solved by technology

As a result, a plurality of unit transistors operate unevenly

If a plurality of unit transistors operate unevenly, desired amplification characteristics cannot be obtained

Images