Amplifiers – Signal feedback – Combined with control of bias voltage of signal amplifier
Patent
1975-04-25
1976-06-08
Zazworsky, John
Amplifiers
Signal feedback
Combined with control of bias voltage of signal amplifier
307264, 330 30D, H03G 300
Patent
active
039626504
ABSTRACT:
The disclosed amplifier has a simple structure which is particularly suited for integrated circuit applications. The amplifier includes a differential amplifier having first and second input terminals across which an input signal is developed. Diodes are connected from each of the input terminals to a circuit node. A reference signal is coupled to the input terminals of the differential amplifier and hence to the diodes. A gain control transistor is connected between the circuit node and ground. The conductance of the gain control transistor varies in response to a gain control signal to thereby control the conductance of the diodes. As the conductances of the diodes increase, less of the input signal voltage is developed across the diodes and hence the gain is decreased and vice versa. The d.c. output voltage remains constant even though the gain is changed.
REFERENCES:
patent: 3310688 (1967-03-01), Ditkofsky
patent: 3538448 (1970-11-01), Harford
patent: 3641450 (1972-02-01), Lunn
patent: 3717821 (1973-02-01), Amemiya et al.
patent: 3764931 (1973-10-01), Waku et al.
Bingham Michael D.
Jones, Jr. Maurice J.
Motorola Inc.
Weiss Harry M.
Zazworsky John
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