Bias and AGC control of two RF amplifiers with a shared control

Details Bias and AGC control of two RF amplifiers with a shared control Bias and AGC control of two RF amplifiers with a shared control

1983-12-23

1985-12-10

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330126, 330295, H03G 318

Patent

active

045582890

ABSTRACT:
A plurality of common emitter transistor amplifiers have the output of a single operational amplifier applying an AGC signal to their bases. An input of the operational amplifier is connected to the collectors through respective diodes to isolate and to selectively form a feedback loop for the on amplifier from the off amplifier. Another input of the operational amplifier receives the AGC voltage so that the operational amplifier varies the base current and hence the gain of the common emitter transistor which is on.

REFERENCES:
patent: 3493882 (1970-02-01), Seader et al.
patent: 3688198 (1972-08-01), George
patent: 3693091 (1972-09-01), Russell
patent: 3693092 (1972-09-01), Russell
patent: 3823379 (1974-07-01), George

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