CMOS input with Vcc compensated dynamic threshold

Details CMOS input with Vcc compensated dynamic threshold CMOS input with Vcc compensated dynamic threshold

1995-06-12

1996-02-27

Westin, Edward P.

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Signal level or switching threshold stabilization

326 24, 326 83, H03K 190948

Patent

active

054951879

ABSTRACT:
A CMOS inverter circuit is provided which includes a compensation circuit which modifies the input threshold of the inverter depending on changes in the supply voltage. The inverter includes a standard CMOS inverter, current boosting circuitry and a further inverter. The input of the inverter is coupled to the current boosting circuitry and the input of the further inverter. The current boosting circuitry is also coupled to one of the supply voltages. The current boosting circuitry is operative to effectively change the PMOS to NMOS ratio of the inverter to maintain a substantially constant input threshold to counter the effect of any change in supply voltage.

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