Apparatus and method to adjust and filter current DAC signals
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United States of America Patent
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Sep 1, 2009
Grant Date -
Jun 26, 2008
app pub date -
Dec 20, 2006
filing date -
Dec 20, 2006
priority date (Note) -
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Abstract
A technique to adjust gain and DC level of current DAC signals with offset to generate a voltage signal that is used to control power level of a power amplifier. One or more current mirrors from a set of current mirrors is programmably selected to set gain of a current-to-voltage conversion stage. A second set of current mirrors used to adjust DC level current is oppositely tracked to the current mirrors used for the gain. The opposite tracking allows for deactivation (or activation) of respective current mirrors in the second set in response to activation (or deactivation) of respective gain setting current mirrors to maintain a substantially constant DC level when gain values are changed. An additional set of current mirrors allows for independent compensation of DC offsets.
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