Low power wideband switching array element

Details Low power wideband switching array element Low power wideband switching array element

1983-09-27

1985-08-13

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 86, 307243, 307254, H04N 522, H04N 100, H04N 568, H04N 564

Patent

active

045353603

ABSTRACT:
A switching array comprising low power switching elements for switching high bandwidth pulse encoded signals with minimum distortion. Each switching element comprises an emitter-coupled pair of transistors which are used to switch the pulse encoded signals. The pair of transistors are enabled and disabled by inhibiting the flow of electrical current through the latter. A transistorized switch controls the electrical current in the pair of transistors in response to signals from a control register within the switching array. Since no current is flowing in the pair of transistors when the element is inhibited, the power dissipation approaches zero in the inhibit state resulting in an overall low power dissipation for the switching array since only a small number of elements are normally enabled at any time. Each element further comprises an emitter-follower transistor for the purpose of isolating the pair of transistors from the remainder of the switching array in order to reduce the crosstalk between pulse encoded signals.

REFERENCES:
patent: 3497824 (1970-02-01), Goordman
patent: 3846712 (1974-11-01), Kiko
patent: 3904977 (1975-09-01), Barsotti
patent: 4048626 (1977-09-01), Fett
patent: 4339674 (1982-07-01), Hashimoto
patent: 4346381 (1982-08-01), Bauch et al.
patent: 4349750 (1982-09-01), Geurts
The Line Driver and Line Receiver Data Book for Design Engineers, 1977, p. 28.

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