Amplifying apparatus with a differential amplifier stage

Details Amplifying apparatus with a differential amplifier stage Amplifying apparatus with a differential amplifier stage

1990-05-30

1991-10-22

Mullins, James B.

Amplifiers

Combined with automatic amplifier disabling switch means

330260, H03H 345

Patent

active

050599194

ABSTRACT:
An amplifying device comprises a differential amplifier stage, which includes a first transistor supplied with an input signal and a second transistor supplied with an output signal as a negative feedback signal, and a third transistor for detecting cutoff of a power supply voltage to be supplied to the differential amplifier stage. The third transistor controls a fourth transistor which sets the potential at the base of the first transistor at the ground level. The base of the first transistor is connected to the base of a fifth transistor, which controls a sixth transistor connected between the ground and the base of the second transistor so that in a power-off state, the fourth and sixth transistors render the potentials at the bases of the first and second transistors to be the ground level.

REFERENCES:
patent: 4853648 (1989-08-01), Imanishi

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