Electronic attenuation value control circuit in which switching

Details Electronic attenuation value control circuit in which switching Electronic attenuation value control circuit in which switching

1984-07-26

1987-07-28

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307243, 307550, 307585, 333 81R, 455219, 455194, H03K 1716, H03K 17693, H03H 724

Patent

active

046833862

ABSTRACT:
A digital controlled volume attenuator includes a plurality of resistors connected in series between a signal input terminal and a reference potential point and a plurality of electronic switches having one ends respectively connected to the connection points among resistors and the other ends connected in common. One of signals at the respective connection points among resistors is selected by making either one of the switches conductive to control the volume. A muting circuit is provided between a signal output terminal and the common connection point of the switches to prevent the switching noise generated by the switches from being supplied to the signal output terminal.

REFERENCES:
patent: 3229218 (1966-01-01), Sickles, II et al.
patent: 3806820 (1974-04-01), Uchiyama
patent: 3866064 (1975-02-01), Gregory et al.
patent: 4121183 (1978-10-01), Murphy
patent: 4529897 (1985-07-01), Suzuki et al.

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