Accurate resistance capacitance (RC) time constant calibration with metal-oxide-metal (MOM) capacitors for precision frequency response of integrated filters
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United States of America Patent
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Jan 29, 2013
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N/A
app pub date -
Dec 18, 2008
filing date -
Dec 18, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A calibration system employed for use with a resistance capacitance (RC) filter having resistors and capacitors with parasitic capacitance associated therewith. The calibration system has a digital calibration circuit receiving a time constant signal and generating, based thereon, a control word of N digital bits. The calibration system includes an analog monitor circuit having monitor capacitance assembly having a particular equivalent resistor and capacitor configuration. The analog monitor circuit generates the time constant signal and includes N switches, where each switch is controlled by one of the N bits of the control word, each switch is configured to connect or disconnect one or more capacitors of the monitor capacitor assembly thereby generating a time constant signal that represents the time constant of the RC integrated filter.
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