Auto-Averaging RC Time Constant Calibration
First Claim
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1. A calibration circuit comprising:
- two capacitor branches, wherein each capacitor branch includes a current source, at least one capacitor and a switch;
a resistor branch connected to the two capacitor branches, that includes a current source that induces a reference voltage and a resistor; and
a counter and charge commutation control that tracks charging cycles of the capacitors as they are charged and discharged.
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Abstract
This disclosure relates to auto-averaging RC time constant calibration are described. An auto-averaging calibration circuit includes two capacitor branches, where capacitors in the capacitor branches, charge and discharge alternately to accommodate multiple charging cycles in one measurement cycle for measuring a RC time constant. A value of RC time constant is obtained in each charging cycle. A final value of the RC time constant can be determined by averaging various values of the time constants obtained during each charging cycle.
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Citations
20 Claims
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1. A calibration circuit comprising:
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two capacitor branches, wherein each capacitor branch includes a current source, at least one capacitor and a switch; a resistor branch connected to the two capacitor branches, that includes a current source that induces a reference voltage and a resistor; and a counter and charge commutation control that tracks charging cycles of the capacitors as they are charged and discharged. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus comprising:
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a circuit that includes passive RC components; and an auto-averaging calibration circuit to calibrate RC time constants for the RC components comprised of; a) at least two capacitor branches, wherein each capacitor branch includes a current source, at least one capacitor, and a switch; b) a resistor branch connected to the capacitor branches, that includes a current source that induces a reference voltage, and a resistor; and c) a counter and commutation control that tracks charging cycles of the capacitors as they are charged and discharged; and a digital control that controls the auto-averaging calibration circuit. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for averaging RC time constant calibration in a circuit comprising:
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specifying a number of charging cycles for at least two capacitors in a calibration circuit; charging a first capacitor to a reference voltage and discharging a second capacitor, wherein the first and second capacitors are tunable to a value corresponding to a cut-off frequency value for the circuit; measuring an RC time constant value of the capacitors after each charging cycle; and averaging the measured RC time constant values. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification