Low pass active filter apparatus

Details Low pass active filter apparatus Low pass active filter apparatus

1976-01-02

1976-12-21

Heyman, John S.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

328151, 333 70CR, 179 15A, H03B 104

Patent

active

039991377

ABSTRACT:
The subject of the disclosure is low-pass filter apparatus for use in filtering out noise in a signal channel for propagating PAM signals. A sample and hold circuit which operates in synchronism with the presence of PAM pulses is provided as the input section. The output of the sample and hold circuit is applied to a four-pole, low-pass, RC active filter network. An adjustment is made to the active filter network such that the filter network's low frequency complex pole pair is changed to provide compensation for an undesired roll-off of band pass in the intended in-band region due to the frequency response characteristics of the sample and hold circuit. The resultant apparatus provides a significant reduction in active filter gain required for a given PAM duty cycle. It also provides increased noise rejection capability in the out-of-band region of operation.

REFERENCES:
patent: 3537019 (1970-10-01), Reichard
patent: 3696252 (1972-10-01), Chapman
patent: 3838346 (1974-09-01), Cox
patent: 3919648 (1975-11-01), Uetrecht

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