Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Bus or line termination
Reexamination Certificate
2008-04-22
2008-04-22
Barnie, Rexford (Department: 2819)
Electronic digital logic circuitry
Signal sensitivity or transmission integrity
Bus or line termination
Reexamination Certificate
active
07362128
ABSTRACT:
A programmable impedance control circuit for use in a semiconductor device having an impedance range shifting function prevents or substantially reduces an impedance detection failure based on an environment change. An impedance detector includes a first array driver, a second array driver, and an impedance matching transistor array and a range shifting transistor array independently controlled by the first and second array drivers. A comparator each compares first and second output voltage levels of the impedance detector with an array reference voltage, and outputs an up/down signal as the comparison result. A counter performs an up/down counting in response to the up/down signal, and outputs control code data. A range shifting circuit monitors a counting output of the counter and so generates range shifting data. Whereby, even if there is an environment change on a manufacturing process, power source voltage or operating temperature, etc., an impedance matching and correction operation can be performed without a waste of impedance matching transistor array and control code.
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Choi Myung-Han
Lee Young-Dae
Park Chul-Sung
Barnie Rexford
Marger & Johnson & McCollom, P.C.
Samsung Electronics Co,. Ltd.
Tran Thienvu V
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