Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Bus or line termination
Reexamination Certificate
2008-11-05
2010-10-26
Cho, James H. (Department: 2819)
Electronic digital logic circuitry
Signal sensitivity or transmission integrity
Bus or line termination
C326S087000, C327S112000
Reexamination Certificate
active
07821291
ABSTRACT:
A calibration circuit for matching the output impedance of a driver by calibrating adjustments to the driver is described. The calibration circuit includes a driver circuit with a plurality of calibration transistors configured to receive a plurality of adjustment signals. The calibration circuit also includes a comparator circuit, and a binary searcher. The driver provides a signal corresponding to an output impedance to the comparator circuit. The output impedance signal is compared to a target impedance, and the comparator circuit then provides logic signals to the binary searcher representing whether the output impedance is greater than the target impedance. The binary searcher then selects a type of step size and count direction, in response to the logic signals, to count the number of steps for adjusting the calibration transistors of the driver.
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Cho James H.
Crawford Jason
Dorsey & Whitney LLP
Micro)n Technology, Inc.
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