SUPER-BROADBAND DISTRIBUTED AMPLIFIER CIRCUIT EQUIPPED WITH ACTIVE LOADING APPARATUS FOR BIAS APPLICATION

摘要

PPROBLEM TO BE SOLVED: To stabilize bias application conditions of a super-broadband distributed amplifier circuit (100). PSOLUTION: The amplifier circuit (100) has a plurality of transistors (T1) each terminated in loads (Zin, Zout) of one of their terminals and parallel connected between a drain line and a gate line, and indicates total impedance equal to impedance of the load (Zout) connected to a terminal of a drain line of the amplifier circuit block (100), a bias application circuit (200) has at least one transistor (T2) connected between a power source (VSBDD/SB) and the drain line of the amplifier circuit (100), a gate (G2) of the transistor (T2) is connected to divided bridges (R1R2, R1T3) to fix a potential (VSBG2/SB) of the gate (G2), and the gate (G2) of the transistor (T2) and its source (S2) are mutually connected via a capacitor (C1). PCOPYRIGHT: (C)2004,JPO