Process insensitive off-chip driver

Details Process insensitive off-chip driver Process insensitive off-chip driver

1995-04-12

1996-07-09

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327 2, 327 12, 326 87, H03B 100

Patent

active

055348033

ABSTRACT:
A small and efficient control circuit for a compensated CMOS off-chip driver and a driver circuit incorporating the control circuit. The control circuit uses an exclusive OR gate as a phase detector to determine the phase difference between a system clock and a delayed version of the system clock. An RC filter smooths the output of the exclusive OR gate to produce a voltage proportional to the delay introduced in the CMOS circuitry by environmental and process variables. The voltage from the RC filter is used as a control voltage to control the effective channel width of the effective pull-down device of the off-chip driver circuit. An off-chip driver using the control circuit is used in the I/O unit of a CMOS integrated circuit chip.

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patent: 5220216 (1993-06-01), Woo
patent: 5297179 (1994-03-01), Tatsumi
patent: 5307067 (1994-04-01), Kimura et al.
patent: 5428309 (1995-06-01), Yamauchi et al.

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