Switched-capacitor variable equalizer

Details Switched-capacitor variable equalizer Switched-capacitor variable equalizer

1982-08-25

1985-01-15

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Equalizers

333173, 330304, 330109, H04B 314

Patent

active

044940823

ABSTRACT:
An equalizer for non-loaded telephone lines comprises an active switched-capacitor biquadratic filter including two differential amplifiers. An unswitched capacitor connected between the output and inverting input of one amplifier is variable to vary the equalizer response, the output being derived from the output of the other amplifier. One or more through-switched input capacitors can be simultaneously variable to provide a fixed equalizer gain at a predetermined frequency. The variable capacitors are constituted by fixed capacitors selectively switched in parallel with one another.

REFERENCES:
patent: 4315227 (1982-02-01), Fleischer et al.
Gazin J. F. "The MOS Transistor--an Analogue Switching Device Part 2; Application". Electronic Components, vol. 16, No. 15, Sep. 10, 1974, pp. 31-34.

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