Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Bus or line termination
Reexamination Certificate
2006-05-04
2009-06-16
Barnie, Rexford N (Department: 2819)
Electronic digital logic circuitry
Signal sensitivity or transmission integrity
Bus or line termination
C326S083000, C327S170000
Reexamination Certificate
active
07548086
ABSTRACT:
An impedance control circuit includes an impedance detector, an output driver and an impedance controller. The impedance detector generates a first output value to a detection pad connected between an external determination resistor and a pull-up transistor array, and outputs a second output value to a resistance divider terminal commonly connected between a pull-up and pull-down transistor array in response to a pull-up control code data and a pull-down control code data. The output driver has a commonly connected pull-up and pull-down transistor array, and a compensating unit connected to the pull-up and pull-down transistor array of the output driver, to compensate for quantization error of the pull-up and pull-down control code data. The impedance controller performs a comparison and counting operation so that the first and second output values of the impedance detector become approximated to a predetermined reference value, and generates the pull-up and pull-down control code data.
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Cho Uk-Rae
Kim Tae-Hyoung
Kwon Ji-Suk
Barnie Rexford N
F. Chau & Associates LLC
Samsung Electronics Co,. Ltd.
White Dylan
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