Amplifiers – Signal feedback – Combined with control of bias voltage of signal amplifier
Patent
1976-04-16
1977-07-05
Mullins, James B.
Amplifiers
Signal feedback
Combined with control of bias voltage of signal amplifier
330 22, 330 28, H03F 345
Patent
active
040343065
ABSTRACT:
An integrated circuit direct coupled amplifier capable of operating from a single battery cell, has: a differential amplifier input stage having an input transistor and a second transistor; an intermediate gain stage; and an output stage. Signal is fed back from the output stage to the base of the second transistor of the differential amplifier, through a negative feedback circuit. Current sources are connected as loads in the collector circuits of the input transistor of the differential amplifier and the transistor of the intermediate gain stage. The current sources are biased by separate bias sources, to improve stability. The bias source for the intermediate gain stage current source also biases a current source for the feedback circuit. A starting circuit is connected to the bias source for the intermediate gain stage and provides self starting for the current sources. Frequency compensation elements are located in the base-collector circuit of the intermediate gain stage transistor to stabilize the amplifier, and a gain control resistor connected to the base of the second transistor of the differential stage operates by varying the negative feedback in the amplifier.
REFERENCES:
patent: 3077566 (1963-02-01), Vosteen
patent: 3801923 (1974-04-01), Russell et al.
patent: 3904972 (1975-09-01), Seki et al.
Barber Herbert Douglas
Salter Gary Curtis
Linear Technology Inc.
Mullins James B.
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