Electronic low-pass filter circuit with an adjustable long time

Details Electronic low-pass filter circuit with an adjustable long time Electronic low-pass filter circuit with an adjustable long time

1979-11-19

1982-04-27

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

328167, 331 25, H03L 708, H04B 1500

Patent

active

043273351

ABSTRACT:
A filtering circuit having the behavior of a low-pass filter capable of having a long time constant. The filtering circuit comprises an input circuit for receiving a voltage input signal to be filtered. A summator circuit is provided for monitoring the input signal relative to an analog output signal from an accumulator circuit and providing an error signal representative of the difference of the input and output signals. The error signal is fed to a voltage controlled oscillator to generate a frequency signal proportional to the error signal. The accumulator has a frequency dividing circuit is provided to divide the frequency signal by a predetermined division factor to control the low cut-off frequency of the filtering circuit whereby to increase the response time thereof. The accumulator also integrates the divided frequency signal. An output circuit provides an output of the stored integrated frequency signal to constitute the analog output signal.

REFERENCES:
patent: 3550018 (1970-12-01), James et al.

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