Self-compensating output pad for an integrated circuit and metho

Details Self-compensating output pad for an integrated circuit and metho Self-compensating output pad for an integrated circuit and metho

1992-08-07

1994-11-15

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Having specific delay in producing output waveform

327237, H03K 513, H03K 526

Patent

active

053651308

ABSTRACT:
An output pad for an integrated circuit includes circuitry to align the output with an on-chip clock signal, and to compensate the output such that it remains coincident with the on-chip clock signal even when changes occur in power supply voltage, manufacturing process and temperature. This output pad has a closed-loop feedback circuit which controls the delay of the output signal through a variable delay element. The loop adjust the delay until the clock edge of the on-chip clock signal is coincident with the output signal within a defined tolerance. The output pad self-compensates with every clock cycle, which is many times faster than any induced variation.

REFERENCES:
patent: 4795985 (1989-01-01), Gailbreath

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