Process compensating variable impedence I/O driver with feedback

Details Process compensating variable impedence I/O driver with feedback Process compensating variable impedence I/O driver with feedback

1992-07-01

1994-04-26

Westin, Edward P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307443, 307263, H03K 1920

Patent

active

053069650

ABSTRACT:
An integrated circuit output driver circuit is disclosed. The output driver varies the impedance of the driver circuit based upon the output voltage level present on the output pad. In that manner, the output driver circuit compensates for process variations and operating conditions. Two FETs are used in parallel to pull the voltage level of the output pad down. One FET is turned on and left on whenever a low voltage level in the output pad is desired. The other smaller FET is used to vary the total impedance of the driver by using feedback from the signal pad to sense when the pad voltage has reached a threshold level at that point the second FET is turned off.

REFERENCES:
patent: 4777389 (1988-10-01), Wu
patent: 4779013 (1988-10-01), Tanaka
patent: 4880997 (1989-11-01), Steele
patent: 5015880 (1991-05-01), Drake
patent: 5091658 (1992-02-01), Pribyl
patent: 5153457 (1992-10-01), Martin

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