Miscellaneous active electrical nonlinear devices – circuits – and – Gating – Converging with plural inputs and single output
Patent
1997-04-09
2000-03-21
Le, Dinh
Miscellaneous active electrical nonlinear devices, circuits, and
Gating
Converging with plural inputs and single output
327427, 327437, 327 96, 327 94, 327563, H03K 19094, H03K 1716
Patent
active
060407328
ABSTRACT:
A switched-transconductance circuit for use in a multiplexer circuit includes integrated T-switches to provide isolation between each of the differential voltage inputs of a transconductance stage and: (1) a respective differential current output of the transconductance stage, and (2) the opposite polarity voltage input of the transconductance stage. Each of a pair of first switches, which are enabled only when the transconductance circuit is disabled, is connected between a differential current output of the transconductance stage and a circuit ground. Each of a pair of second switches, e.g., cascode transistors, which are biased to be turned on only when the transconductance circuit is enabled, is coupled between the output of the transconductance stage and an output of the transconductance circuit. A third switch is connected between a common-emitter node of a differential pair of input transistors included in the transconductance stage and a circuit ground. By turning on the third switch: (1) current from a current source driving the differential pair of input transistors is steered away from the input transistors so as to disable the transconductance stage, and (2) a low impedance path is provided between the common-emitter node and ground.
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Analog Devices Inc.
Le Dinh
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