Precision operational amplifier using data sampling

Details Precision operational amplifier using data sampling Precision operational amplifier using data sampling

1985-12-23

1986-11-11

Mullins, James B.

Amplifiers

With periodic switching input-output

330253, H03F 102, H03F 345

Patent

active

046225218

ABSTRACT:
Offsets in a chopper stabilized CMOS operational amplifier are nulled by adjusting the transconductance of the load transistors in the CMOS transistor pairs. This is accomplished by providing a small N channel transistor in parallel with each N channel load transistor of the CMOS pairs. A bias voltage is applied to the gate of one of the transistors and a voltage applied to the gate of the other N channel transistor. The voltage is developed by shorting the inputs to the operational amplifier and closing a feedback path around the input stage to null its offset. The nulling voltage taken at the gate of the other N channel transistor is capacitively stored and used during the subsequent sampling cycle.

REFERENCES:
Kash, "Building Quality Analog Circuits with C-MOS Logic Arrays", Electronics, vol. 54, No. 16, Aug. 11, 1981, pp. 109-112.

Affiliated with

Also associated with

Rating

Precision operational amplifier using data sampling does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Precision operational amplifier using data sampling, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Precision operational amplifier using data sampling will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-378880