Chopper-stabilized amplifier with spread-spectrum clocking

Details Chopper-stabilized amplifier with spread-spectrum clocking Chopper-stabilized amplifier with spread-spectrum clocking

1991-04-10

1992-05-19

Mullins, James B.

Amplifiers

With periodic switching input-output

307491, H03F 102

Patent

active

051152029

ABSTRACT:
A high bandwidth chopper-stabilized amplifier operates main and auxiliary amplifiers at a randomized chopping signal frequency that substantially reduces intermodulation distortion between the input and chopping signals, clock noise and input voltage offset, thus making possible a significant increase in bandwidth. The circuit preferably uses a pseudo-random bit sequence generator to produce a pseudo-random chopping signal frequency.

REFERENCES:
patent: 4931745 (1990-06-01), Goff et al.
Jones and Webb, "Chopper-stabilized op amp combines MOS and bipolar elements on one chip", Electronics, Sep. 27, 1973, pp. 209-213.
Lee and Messerschmitt, Digital Communication, Chap. 10.6, "Spread-Spectrum", Kluwer Academic Publishers, 1988, pp. 445-450.

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