Compace HBT wide band microwave variable gain active feedback am

Details Compace HBT wide band microwave variable gain active feedback am Compace HBT wide band microwave variable gain active feedback am

1993-07-06

1994-10-11

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including gain control means

330282, H03G 312

Patent

active

053550960

ABSTRACT:
A variable gain amplifier includes a first transistor including a base, and an emitter, and a collector. A first parallel feedback device connected to the collector and the base of the first transistor provides an inductive impedance. A second parallel feedback device connected to the collector and the base of the first transistor provides a variable resistive impedance and includes a monolithically integrated p-i-n diode having a quiescent bias current flowing therethrough. The gain response of the first transistor is related to the variable resistive impedance of the second parallel feedback device.

REFERENCES:
patent: 4771247 (1988-09-01), Jacomb-Hood
patent: 4816778 (1989-03-01), Weber
patent: 5047731 (1991-09-01), Lee
patent: 5051372 (1991-09-01), Sasaki
patent: 5051705 (1991-09-01), Moghe

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