Hybrid binary/thermometer code for controlled-voltage...

Details Hybrid binary/thermometer code for controlled-voltage... Hybrid binary/thermometer code for controlled-voltage...

2006-08-08

2006-08-08

Cho, James H. (Department: 2819)

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Bus or line termination

C326S021000

Reexamination Certificate

active

07088129

ABSTRACT:
A hybrid binary/thermometer code is employed to adjust the output impedance of a variable impedance output driver circuit having an impedance network comprising a plurality of impedance legs each programmably electrically connectable according to the hybrid binary/thermometer code in parallel between a voltage source and the signal pad. The plurality of impedance legs are partitioned into one or more set pairs of binary stepped impedance legs and corresponding thermometer stepped impedance legs. A binary set of calibration signals in the hybrid binary/thermometer code steps a given set of binary stepped impedance legs according to a binary code and a thermometer set of calibration signals in the hybrid binary/thermometer code steps the corresponding set of thermometer stepped impedance legs according to a thermometer code once per full count iteration of the binary set of calibration signals.

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