Chopper-stabilized operational amplifier including low-noise cho

Details Chopper-stabilized operational amplifier including low-noise cho Chopper-stabilized operational amplifier including low-noise cho

1997-03-03

1999-09-28

Mottola, Steven

Amplifiers

With periodic switching input-output

327124, H03F 102

Patent

active

059594985

ABSTRACT:
To minimize noise generation a chopper switch for a chopper stabilized operational amplifier includes a balanced bridge circuit with two pairs of high-side and low-side transistors connected in parallel. The transistors are not turned completely off but operate in the manner of variable resistors between a high-resistance level and a low-resistance level. One or more additional transistors are include to provide a parasitic capacitance in the break-before-make interval when all of the other transistors are turned off. To provide rail-to-rail operation, complementary circuits contain N-channel and P-channel transistors are connected in parallel between the input and output terminals of the chopper switch.

REFERENCES:
patent: 4947135 (1990-08-01), Mijuskovic
patent: 5115202 (1992-05-01), Brown
patent: 5600283 (1997-02-01), Sauer
Jones, Don and Webb, Robert W., "Chopper-Stabilized Op Amp Combines MOS and Bipolar Elements on One Chip", Electronics, Sep. 27, 1973, pp. 110-114.
Frederiksen, Thomas M., Intuitive IC OP AMPS, National Semiconductor Technology Series, 1984, Santa Clara, CA, pp. 8-12.
Horowitz, Paul and Hill, Winfield, The Art of Electronics, Cambridge University Press, 1980, New York, pp. 80-86, 286-307.
Smith, Ralph J., Electronics: Circuits and Devices, John Wiley and Sons, 1980, New York, pp. 434-457.

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