Bandwidth Calibration for Filters
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United States of America Patent
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Issued Date -
Jun 26, 2014
app pub date -
Dec 20, 2012
filing date -
Dec 20, 2012
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A low power, high accuracy calibration circuit for filter calibration is provided. The calibration circuit includes a chargeable voltage storage element. A first measurement and adjustment circuit determines a charge time required for the voltage of the chargeable voltage storage element to substantially match a reference voltage. The circuit adjusts the voltage storage element to make the charge time approximately equal to a predetermined filter time constant value, the adjustment circuit updating the reference voltage to make the charge time substantially equal to the predetermined filter time constant value and iteratively updating the reference voltage to refine the charge time. A second circuit is configured to have substantially the predetermined filter time constant value based on the adjustment configuration determined by the adjustment of the voltage storage element and the reference voltage of the first circuit.
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