Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1998-04-03
1999-11-02
Pascal, Robert
Amplifiers
With semiconductor amplifying device
Including gain control means
330129, H03G 310
Patent
active
059778318
ABSTRACT:
A hybrid system (18) for control and monitoring of an amplifier (330) is provided. The hybrid control system (18) includes an analog control subsystem (81) and a digital control subsystem (82). The analog control system provides an automatic gain control loop for maintaining the gain of amplifier (330) at a predetermined level. The digital control subsystem (82) monitors a plurality of operating characteristics of amplifier (330) and commands the analog control subsystem (81) to reduce the gain of amplifier (330) responsive to certain predetermined fault conditions. The digital control subsystem (82) shuts down amplifier (330) responsive to other predetermined fault conditions. The digital control subsystem (82) also controls the power-on sequence and power-down sequence for amplifier (330), insuring that the gate bias voltage is first applied or maintained before the drain voltage is applied or removed.
REFERENCES:
patent: 3668556 (1972-06-01), Harbeson
patent: 3900823 (1975-08-01), Sokal et al.
patent: 4165493 (1979-08-01), Harrington
patent: 4631491 (1986-12-01), Smithers
patent: 4916407 (1990-04-01), Olver
patent: 5101173 (1992-03-01), DiPiazza et al.
Davis Carlton Daniel
Dodd Joseph Wayne
Dominick Thomas Steve
CBS Corporation
Choe Henry
Lenart Robert P.
Pascal Robert
LandOfFree
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