Dynamic adaptive terminal load adjusting method and circuit
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United States of America Patent
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Issued Date -
Dec 16, 2010
app pub date -
Jun 10, 2010
filing date -
Jun 11, 2009
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Abandoned
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Abstract
A dynamic adaptive terminal load adjustment method includes comparing a voltage on an on-chip termination impedance driven by an on-chip current source with a voltage of a band gap reference circuit to get an optimal trimming parameter by an adaptive control mechanism, wherein the optimal trimming parameter is applied to a terminal by an output control circuit to have a feedback control. The present invention is on-chip so the cost is saved. The terminal is separated from the adjusting circuit, thus the present invention has a good dynamic performance. Compared with laser trimming, no expensive cost is needed in the present invention. The present invention saves an IO pin without an external device, has the good temperature characteristic and high resistance regulation accuracy. Furthermore, the adjusting circuit is separated from the terminal load circuit by high matching of relative resistance of CMOS process, thus reducing the adverse impact.
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