Filter cut-off frequency correction circuit

Details Filter cut-off frequency correction circuit Filter cut-off frequency correction circuit

2010-01-08

2011-10-25

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

C327S034000

Reexamination Certificate

active

08044710

ABSTRACT:
A filter cut-off frequency correction circuit, inputted with a step function increasing from a first voltage to a second voltage, comprises a linear passive filter, for integrating the step function to obtain a third voltage; a first comparator, outputting a first high-level signal when the third voltage is greater than a first predetermined reference voltage; a second comparator, outputting a second high-level signal in a first period from the time that the second voltage is applied to the time that the first comparator outputs the first high-level signal; a counter, for counting a number of clock pulses of a reference clock inputted in the first period; a digital block, for calculating a variation rate of time constant according to the number of clock pulses of the reference clock, and generating a correction code; and a filter, for correcting the cut-off frequency according to the correction code. The correction circuit can improve the speed of cut-off frequency adjustment.

REFERENCES:
patent: 5245646 (1993-09-01), Jackson et al.
patent: 5416438 (1995-05-01), Shibata
patent: 6628163 (2003-09-01), Dathe et al.

Affiliated with

Also associated with

Rating

Filter cut-off frequency correction circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Filter cut-off frequency correction circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Filter cut-off frequency correction circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4287025