Analog signal multiplexer

Details Analog signal multiplexer Analog signal multiplexer

1986-10-14

1988-08-30

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307494, 3072992, H03K 1756, H03K 1908, H03K 522

Patent

active

047679450

ABSTRACT:
An analog signal multiplexer for differential signals comprises a plurality of channels, each channel having a pair of differential amplifiers forming an input stage for receiving a differential input signal and a pair of output transistors for forming an output stage producing a differential output signal. Each differential amplifier has a pair of emitter-coupled transistors, with each transistor having an additional emitter cross-coupled to the additional emitter of the opposite transistor of the other emitter-coupled pair. A plurality of current sources are provided to bias the emitter-coupled and emitter cross-coupled pairs. By selectively enabling the current sources, the input signals forming the differential input signal can be applied with normal polarity or inverted polarity to a respective transistor of the output stage to produce a normal or inverted differential output signal or to both transistors of the output stage to produce no differential output signal.

REFERENCES:
patent: 3851187 (1974-11-01), Pao et al.
patent: 3868586 (1974-02-01), Korb
patent: 4193007 (1980-03-01), Tietz

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