Patent Number: 6,166,604

Title: Semiconductor amplifier with compensated passing gain characteristic and passing phase characteristic

Abstract: A semiconductor amplifier with a compensated passing gain characteristic and passing phase characteristic is disclosed. Connected to an input to a non-linear amplifying element is a characteristic improving circuit comprising a passive circuit including a capacitor, a resistor, and an inductor, and an FET connected to the passive circuit and having its source and a drain both grounded. In the characteristic improving circuit, with an increase in the input level, a gate capacitance of the FET is increased to enhance the passing gain and reduce the passing phase. Such characteristics of the characteristic improving circuit compensate for the characteristics of the FET to improve a phase characteristic and a distortion characteristic of the non-linear amplifying element at an output level.

Inventors: Matsunaga; Kohji (Tokyo, JP)

Assignee: NEC Corporation

International Classification: H03F 1/32 (20060101); H03F 001/26 (); H03F 001/30 ()

Expiration Date: 12/26/2017