Notch filter for ripple reduction in chopper stabilized...

Details Notch filter for ripple reduction in chopper stabilized... Notch filter for ripple reduction in chopper stabilized...

2007-11-06

2007-11-06

Choe, Henry (Department: 2817)

Amplifiers

With periodic switching input-output

C330S069000

Reexamination Certificate

active

11340223

ABSTRACT:
A chopper-stabilized amplifier receiving an input signal includes a first operational transconductance amplifier having an input chopper and an output chopper for chopping an output signal produced by the first operational transconductance amplifier. A switched capacitor notch filter filters the chopped output signal by operating synchronously with the chopping frequency of output chopper to filter ripple voltages that otherwise would be produced by the output chopper. In one embodiment, a second operational transconductance amplifier amplifies the notch filter output. The input signal is fed forward, summed with the output of the second operational transconductance amplifier, and applied to the input of a fourth operational transconductance amplifier. Ripple noise and offset are substantially reduced.

REFERENCES:
patent: 5382956 (1995-01-01), Baumgartner et al.
patent: 5663680 (1997-09-01), Nordeng
patent: 7132883 (2006-11-01), Huijsing et al.
patent: 7202738 (2007-04-01), Huijsing et al.
“Circuit Techniques for Reducing the Effects of Op-Amp Imperfections: Autozeroing, Correlated Double Sampling, and Chopper Stabilization” by Christian C. Enz and Gabor C. Temes, Proceeding of the IEEE, vol. 84, No. 11, Nov. 1996, pp. 1584-1614.

Affiliated with

Also associated with

Rating

Notch filter for ripple reduction in chopper stabilized... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Notch filter for ripple reduction in chopper stabilized..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Notch filter for ripple reduction in chopper stabilized... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3882135