Amplifier circuit more immune to fluctuation of reference voltag

Details Amplifier circuit more immune to fluctuation of reference voltag Amplifier circuit more immune to fluctuation of reference voltag

1989-08-28

1990-11-20

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330149, 330253, 330298, H03F 345, H03F 126

Patent

active

049721593

ABSTRACT:
An amplifier circuit having a differential amplifier, provided in a semiconductor integrated circuit is disclosed. The differential amplifier has one input connected to a reference voltage generating circuit. The voltage outputted from the reference voltage generating circuit includes a voltage fluctuation depending on the fluctuation in power-supply voltage Vcc. However, a fluctuation absorbing circuit comprising resistors 51 and 52, diodes 53 and 54, and a capacitor 55 absorbs the voltage fluctuation thereof. As a result, the change in offset voltage of the differential amplifier is prevented, resulting in an improvement of a power-supply rejection ratio.

REFERENCES:
patent: 3918004 (1975-11-01), Shimizu et al.
patent: 4005371 (1977-01-01), Hongu et al.
patent: 4290026 (1981-09-01), Shoji
patent: 4539529 (1985-09-01), Lenz

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