Enhanced voltage tracking circuit for high voltage tolerant buff

Details Enhanced voltage tracking circuit for high voltage tolerant buff Enhanced voltage tracking circuit for high voltage tolerant buff

1997-01-09

1998-02-17

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Nonlinear amplifying circuit

327333, 327535, 327537, 327541, H03K 190175, H03K 19094

Patent

active

057195250

ABSTRACT:
A comparator used in an enhanced N-WELL pad voltage tracking circuit for high (5 Volts) voltage-tolerant buffers is designed to eliminate current leakage when the input/output is tristated and is being driven externally by a weak voltage source. This is accomplished by comparing the pad voltage supplied from the external source to a reference voltage that is a predetermined amount (VTP) less than the low internal voltage source (VDD). Thus, switchover for tracking of the N-WELL voltage tracks very closely the voltage VDD, reducing the differential voltage between the N-WELL and the pad on the pull-up driver for the system, thereby keeping the driver off and eliminating leakage current. The reference voltage is generated either by a diode voltage drop or by a weak source follower.

REFERENCES:
patent: 4439692 (1984-03-01), Beekmans et al.
patent: 5189316 (1993-02-01), Murakami et al.
patent: 5202587 (1993-04-01), McLaury

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