Apparatus and methods for calibrating signal-processing circuitry
First Claim
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1. A calibration circuitry, comprising:
- an adjustable capacitor, the adjustable capacitor having a capacitance that varies in response to a plurality of control signals;
a voltage generator, the voltage generator configured to provide a measurement voltage that depends on the capacitance of the adjustable capacitor;
a reference voltage generator, the reference voltage generator configured to provide a reference voltage; and
a controller, the controller configured to provide the plurality of control signals based on the relative values of the reference voltage and the measurement voltage, wherein the adjustable capacitor is calibrated by holding the plurality of control signals constant after powering up the calibration circuitry.
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Abstract
A calibration circuitry includes an adjustable capacitor, a voltage generator, a reference voltage generator, and a controller. The reference voltage generator provides a reference voltage. The voltage generator provides a measurement voltage that depends on the capacitance of the adjustable capacitor. The capacitance of the adjustable capacitor varies in response to a control signal. The controller provides the control signal based on the relative values of the reference voltage and the measurement voltage.
76 Citations
32 Claims
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1. A calibration circuitry, comprising:
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an adjustable capacitor, the adjustable capacitor having a capacitance that varies in response to a plurality of control signals; a voltage generator, the voltage generator configured to provide a measurement voltage that depends on the capacitance of the adjustable capacitor; a reference voltage generator, the reference voltage generator configured to provide a reference voltage; and a controller, the controller configured to provide the plurality of control signals based on the relative values of the reference voltage and the measurement voltage, wherein the adjustable capacitor is calibrated by holding the plurality of control signals constant after powering up the calibration circuitry. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A radio-frequency (RF) apparatus, comprising:
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a first integrated circuit, including; an adjustable capacitor having a capacitance value adapted to be adjustable in response to a plurality of control signals; a voltage generator configured to generate a measurement voltage that depends in part on the capacitance value of the adjustable capacitor; and a controller configured to receive the measurement voltage and a reference voltage, the controller further configured to provide the plurality of control signals based on the relative values of the measurement voltage and the reference voltage, wherein the adjustable capacitor is calibrated by holding the plurality of control signals constant. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method of calibrating circuitry within a first integrated circuit, comprising:
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adjusting a capacitance value of an adjustable capacitor included within the first integrated circuit, the capacitance value of the adjustable capacitor configured to be adjustable in response to a plurality of control signals; generating a measurement voltage, a voltage value of the measurement voltage being dependent in part on the capacitance value of the adjustable capacitor; supplying to the adjustable capacitor the plurality of control signals generated by a controller, the controller configured to receive the measurement voltage and a reference voltage and to provide the plurality of control signals based on the relative values of the measurement voltage and the reference voltage; and calibrating the adjustable capacitor by holding constant the plurality of control signals. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32)
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Specification