AMPLIFYING CIRCUIT OF MICROWAVE SIGNAL

• Main Authors: YUNOGAMI NORIHIRO, SAEKI MASATO
• Format: Patent
• Language: English
• Published: 25.12.2008
• Subjects: AMPLIFIERS; BASIC ELECTRONIC CIRCUITRY; ELECTRICITY

PROBLEM TO BE SOLVED: To provide an amplifying circuit of a microwave signal capable of setting gate bias voltage near ground potential, preventing changes in the gate bias voltage even when FET amplifying elements are operated near a saturation region, and preventing lowering of output voltage. SOLUTION: A bias circuit connected so that gate bias voltage is supplied for a gate terminal includes: a positive-current amplifying transistor connected between a first voltage terminal for receiving supply of positive voltage and the gate terminal; a negative-current amplifying transistor connected between a second voltage terminal for receiving negative voltage and the gate terminal; a common bias circuit with respect to the positive amplifying transistor and the negative-current amplifying transistor; and a bias setting circuit for supplying gate bias setting voltage corresponding to the gate bias voltage for the common bias circuit. COPYRIGHT: (C)2009,JPO&INPIT