Self back-bias compensating P-driver for multiple voltage switch

Details Self back-bias compensating P-driver for multiple voltage switch Self back-bias compensating P-driver for multiple voltage switch

1996-09-18

1998-09-29

Wambach, Margaret Rose

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

326 80, 326 81, 327535, 327537, 327545, 327546, H03B 100

Patent

active

058150137

ABSTRACT:
The present invention provides an output buffer having a self back-bias compensating circuit that adapts the effective output transistor size to overcome current-reducing threshold voltage shifts caused by connection of the output n-wells to a high voltage. More particularly, this invention provides a circuit configuration in which bias level detection is used to switch in additional PFET legs under high back bias conditions. The extra driver legs are disabled under zero back bias. This compensates for the effect that different voltage switching environments have on PFET performance.

REFERENCES:
patent: 5565794 (1996-10-01), Porter
patent: 5574389 (1996-11-01), Chu
patent: 5583454 (1996-12-01), Hawkins et al.
patent: 5635861 (1997-06-01), Chan et al.

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