Adjustable time constant circuit with constant capacitance and v

Details Adjustable time constant circuit with constant capacitance and v Adjustable time constant circuit with constant capacitance and v

1991-08-14

1993-02-09

Sikes, William L.

Electrical transmission or interconnection systems

With nonswitching means responsive to external nonelectrical...

Temperature responsive

307591, 307605, 307242, H03K 513, H03K 5159

Patent

active

051855402

ABSTRACT:
A time constant circuit for regulating the phases of clock signals of a synchronous system includes a plurality of transfer gates composed of MOS-type transistors whose drain-source leads constitute resistance elements. The time constant is adjusted by selectively activating transfer gates, the capacitance of the circuit being the total structural capacitance of the MOS transistors. To ensure that the capacitance remains constant, each transfer gate is associated with an auxiliary compensating circuit which, when activated, introduces a capacitance of the same value as the capacitance of the gate in the conducting state. The invention likewise relates to a variable-delay circuit using the time constant circuit.

REFERENCES:
patent: 3737683 (1973-06-01), Sangster
patent: 5028824 (1991-07-01), Young
patent: 5030861 (1991-07-01), Hoffman et al.

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