Amplifier with feedback to provide bias adjustment

Details Amplifier with feedback to provide bias adjustment Amplifier with feedback to provide bias adjustment

1999-03-22

2000-08-29

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including particular biasing arrangement

330300, H03F 304

Patent

active

061114669

ABSTRACT:
An amplifier (1) having an amplifier transistor (Tr1) with a gate (G) and drain (D). A feedback circuit (2) couples the drain (D) to the gate (G). The feedback circuit (2) has a direct current blocking capacitor (C1) and low pass filter (R3,C2) with a rectifier (D1) therebetween. In use, radio frequency signals at the drain (D) are processed by the feedback circuit (2) to provide a direct current bias to the gate(G). This bias is dependent upon variations of the radio frequency signals at the drain (D).

REFERENCES:
patent: 3060326 (1962-10-01), Watson
patent: 5406225 (1995-04-01), Iida et al.
patent: 5789983 (1998-08-01), Fujita
patent: 5982236 (1999-11-01), Ishikawa
patent: 5986509 (1999-11-01), Lohninger

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