Programmable impedance control circuit
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United States of America Patent
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Feb 25, 2003
Grant Date -
May 30, 2002
app pub date -
Jul 13, 2001
filing date -
Nov 27, 2000
priority date (Note) -
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Abstract
Disclosed is a programmable impedance control circuit, comprising a voltage divider, the voltage divider comprising an MOS array supplied with a first voltage and an external resistance having an external impedance equal to N times said external resistance. The voltage divider outputs a second voltage. A reference voltage generator is provided for generating a third voltage corresponding to N/(N+M) times said first voltage as a reference voltage for said second voltage, and wherein M times internal impedance is used for N times external impedance (N=M or N.noteq.M).
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