Programmable universal active filter

Details Programmable universal active filter Programmable universal active filter

1988-01-28

1989-08-15

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328167, 330109, 333173, H03K 500, H03H 701

Patent

active

048577782

ABSTRACT:
The invention relates to a microprocessor-programmable, universal active filter. The filter has an input section, an operational amplifier with two input nodes, a bandpass section, a lowpass section and control circuitry which, under clock control, periodically brings one of the inputs of the operational amplifier to within a low, d.c. offset voltage, approaching zero volts, of the other input. The output of the lowpass filter section is coupled to the input of the bandpass filter section and the lowpass section also has a feedback loop back to the bandpass section. The selectivity "Q", the gain, center frequency and the output characteristics, such as bandpass, lowpass, allpass, highpass or notch, of the filter may be selected using MOS switches under microprocessor control.

REFERENCES:
patent: 3795877 (1974-03-01), Poole
patent: 4158818 (1979-06-01), Lerner
patent: 4453132 (1984-06-01), Stamler
Kraus, "Voltage Controlled Universal Filters", Electronic Industry, vol. 8, No. 6, Jun. 1982, pp. 72-73.
Martin et al., "Switched-Capacitor Building Blocks . . . ", IEEE Trans. C&S., vol. CAS-28, No. 6, Jun. 1981, pp. 576-584.

Affiliated with

Also associated with

Rating

Programmable universal active filter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Programmable universal active filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Programmable universal active filter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-123731