Logic gates having fast logic signal paths through switchable ca

Details Logic gates having fast logic signal paths through switchable ca Logic gates having fast logic signal paths through switchable ca

1993-03-05

1994-11-15

Sikes, William L.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Accelerating switching

327482, 326 18, H03K 1700, H03K 400, H03K 1200

Patent

active

053651170

ABSTRACT:
Switchable diffused junction capacitors providing selectable data signal paths in a logic gate. A control circuit, such as a current switch, renders one of the junction capacitors conductive to present a large diffusion capacitance which acts as a fast signal pathway to the respectively applied data signal. Non-conducting junction capacitor presents a negligible diffusion capacitance which essentially acts as an open circuit to the respectively applied data signal. The control circuit response is slow and non-critical. The combination of a slow response control to configure selectable fast response data signal pathways is useful in "half good" or "partial good" semiconductor chip technologies, data buffers with fast flush, and self-test, self-repair chip designs, among others.

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patent: 4806799 (1989-02-01), Pelley, III et al.
R. C. Wong, "Current Switches With Speed-Up Junctions" IBM Technical Disclosure Bulletin, vol. 33, No. 4, pp. 450-452, Sep. 1990.

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