Electronic digital logic circuitry – Clocking or synchronizing of logic stages or gates – Field-effect transistor
Patent
1995-03-01
1996-07-02
Hudspeth, David R.
Electronic digital logic circuitry
Clocking or synchronizing of logic stages or gates
Field-effect transistor
326 34, 326 93, H03K 19017
Patent
active
055326250
ABSTRACT:
A wave propagation circuit having one or more circuit stages. Each circuit stage preferably has the same number of evaluation devices as the number of logic inputs into that circuit stage. The circuit stages alternately precharge and evaluate in a serial, wavelike manner responsive to a clock signal. During the precharge cycle of the clock, a precharge pulse propagates from circuit stage to circuit stage to precharge the output nodes of the circuit stages in a distributed, serial manner. During the evaluation cycle of the clock, a pulsed data signal permits the first stage to evaluate its inputs. Responsive to the output of the first circuit stage, a second circuit stage evaluates its inputs. The circuit further includes forward conduction devices and feedback devices to improve the noise margin and to reduce output errors caused by charge sharing and charge redistribution. Optional power saving circuits precharge an output terminal of a circuit stage during a precharge phase only if that output terminal switches during a previous evaluation phase.
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Hudspeth David R.
Sun Microsystems Inc.
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