Programmable impedance control circuit and method thereof
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United States of America Patent
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-
Aug 6, 2002
Grant Date -
May 2, 2002
app pub date -
May 10, 2001
filing date -
Nov 2, 2000
priority date (Note) -
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Abstract
A programmable impedance control circuit for detecting a characteristic impedance of transmission line to thereby output it to an output driver and on-chip terminator in a semiconductor device. Particularly the circuit serves to control an internal impedance according to a controlled, programmable protocol irrespective of the changes in an external impedance due to factors such as voltage and temperature after an initial internal impedance is set during a locking operation.
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