Switching circuit useful in telephone conference systems

Details Switching circuit useful in telephone conference systems Switching circuit useful in telephone conference systems

1976-12-13

1978-04-25

Brown, Thomas W.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

179 1SW, 330110, 329203, H04M 356, H02M 700, H03F 136

Patent

active

040864324

ABSTRACT:
A switching circuit comprises an operational amplifier with two resistive negative feedback paths including respective unilaterally conducting devices (e.g. diodes) connected in opposite polarity to the output of the amplifier. A first terminal is connected to the electrode of the unilaterally conducting device in one path remote from the output of the amplifier, and a second terminal is connected to the electrode of the unilaterally conducting device in the other path remote from the output of the amplifier. Signals of one polarity only applied to the first terminal appear at the second terminal and signals of the opposite polarity only applied to the second terminal appear at the first terminal. The circuit may include three or more such feedback paths. The values of the resistors in the feedback paths may be adjusted to charge the transfer gain of the circuit. The circuit is of particular value in a telephone conference amplifier using unilateralized signals for connecting each channel to a point common to the channels.

REFERENCES:
patent: 3187325 (1965-06-01), Waldhauer
patent: 3483478 (1969-12-01), Shigaki
patent: 3537025 (1970-10-01), Baum et al.
patent: 3553566 (1971-01-01), Nagy
patent: 3579138 (1971-05-01), Harris
patent: 3816917 (1974-06-01), Jones
patent: 3818139 (1974-06-01), Snyder
M. Peard, "Conference Circuit for Telephone Exchange," IBM Tech. Discl. Bull., Apr., 1970.

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