Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1992-08-07
1994-08-09
Callahan, Timothy P.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307359, 307606, 328 55, H03K 513, H03K 524
Patent
active
053369408
ABSTRACT:
An output pad for an integrated circuit includes circuitry to fix the output delay to a constant value 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 an Adjustable Output Driver. A Fixed Delay Element provides a reference delay that does not change with induced variations. The loop adjusts the delay of the Adjustable Output Driver until the edge of the signal delayed by the Adjustable Output Driver is coincident with the edge of the signal delayed by the Fixed Delay Element within a defined tolerance. In a second embodiment the output pad has a Variable Delay Element with programmable delay values that remain constant over induced variations. In a third embodiment the Fixed Delay Element is deleted, and the delayed signal through the Adjustable Output Driver is compared to and therefore synchronized with a Reference Signal, which may be provided on-chip or from a source external to the chip.
REFERENCES:
patent: 4985639 (1991-01-01), Renfrow et al.
Garinger Ned D.
Sorrells Peter H.
Callahan Timothy P.
Riley Shawn
VLSI Technology Inc.
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