Self-tuning method and apparatus for continuous-time filters

Details Self-tuning method and apparatus for continuous-time filters Self-tuning method and apparatus for continuous-time filters

1995-03-08

2000-08-29

Gordon, Paul P.

Data processing: generic control systems or specific application

Generic control system, apparatus or process

Optimization or adaptive control

700 35, 700 37, 700 71, G05B 1302

Patent

active

061121258

ABSTRACT:
A self-tuning technique for integrated continuous-time filters. The present invention provides a method and apparatus to compensate for post-fabrication or in-operation discrepancies between desired and measured filter characteristics due to variability of the IC fabrication process or due to drift caused by changing conditions such as voltage, temperature. The present invention requires minimal overhead in power and area requirements. Furthermore, the filter being tuned is used to process signals, unlike in the prior art where a similar but separate filter or oscillator is used to tune the bias values for both circuits. Better tuning accuracy is thus obtained in the present invention. The circuit is designed to initiate a self-tuning cycle at power-up or during operation after power-up. Tuning is achieved by injecting a reference signal, and monitoring the phase of the filter output with respect to the phase of the reference signal. The self-tuning circuit then provides a signal to a trim DAC, which applies the appropriate correction signal.

REFERENCES:
patent: Re33267 (1990-07-01), Kraus
patent: 4903192 (1990-02-01), Saito et al.
patent: 5124593 (1992-06-01), Michel
patent: 5256981 (1993-10-01), Fountain
patent: 5281931 (1994-01-01), Bailey
patent: 5384502 (1995-01-01), Volk

Affiliated with

Also associated with

Rating

Self-tuning method and apparatus for continuous-time filters does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Self-tuning method and apparatus for continuous-time filters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Self-tuning method and apparatus for continuous-time filters will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1258480