Calibration for amplifier with configurable final output stage
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United States of America Patent
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Mar 13, 2018
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Apr 17, 2017
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Apr 17, 2017
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Abstract
A method for offset calibration may include decoupling a modulator input of a first path from a first stage output, coupling a second path output to the modulator input, applying a common-mode voltage to a second path input, receiving a calibration signal from the modulator output generated in response to the common-mode voltage, and modifying one or more parameters of the modulator to compensate for an offset between the first path and the second path indicated by the calibration signal. A method for gain calibration may include decoupling a modulator input from a first stage output, decoupling a second path from the first stage output, applying a first test signal to the modulator input, applying a second test signal to a second path input, wherein the second test signal is of opposite phase as the first test signal, coupling a second path output to an amplifier input via a calibration feedback network, receiving a calibration signal from the first stage output generated in response to the first test signal and the second test signal, and modifying one or more parameters of the second path to compensate for a difference in respective gains of the modulator and the second path indicated by the calibration signal.
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