Offset corrected amplifier

Details Offset corrected amplifier Offset corrected amplifier

1986-04-30

1987-11-17

Mullins, James B.

Amplifiers

With periodic switching input-output

330 84, 330253, 330295, H03F 126

Patent

active

047076674

ABSTRACT:
An amplifier circuit having offset voltage and offset voltage drift corrections which does not require resistive feedback and is suitable for use with unmatched high frequency field effect transistor circuits. The described circuit cancels the offset voltage of a signal amplifier and comprises means for applying differential voltages to an operational amplifier, together with a switchable feedback connecting the output of the amplifier to one of its inputs and a capacitor coupled between the feedback input of the amplifier, and one of the differential voltages. This allows amplifying of low level AC signals while reducing the error introduced by the offset voltage or the offset voltage drift of the amplifier.

REFERENCES:
patent: 3936759 (1976-02-01), Macheel
patent: 3988689 (1976-10-01), Ochi et al.
patent: 4190805 (1980-02-01), Bingham
patent: 4209717 (1980-06-01), Mahony
patent: 4229703 (1980-10-01), Bustin
patent: 4374362 (1983-02-01), Sutherland et al.
patent: 4429281 (1984-01-01), Ito et al.
patent: 4539551 (1985-09-01), Fujita et al.

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