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PWM MODULATOR HAVING QUANTIZER WITH CONTROLLABLE ANALOG GAIN AND CALIBRATABLE FOR MULTI-NON-IDEAL GAIN-AFFECTING CHARACTERISTICS
PWM MODULATOR HAVING QUANTIZER WITH CONTROLLABLE ANALOG GAIN AND CALIBRATABLE FOR MULTI-NON-IDEAL GAIN-AFFECTING CHARACTERISTICS
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机译：具有可控模拟增益量化器且可校准的PWM调制器，用于多非理想增益影响特性
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摘要
A PWM modulator has a quantizer that generates a PWM output signal to speaker driver. When a first voltage swing range is supplied to the speaker driver, the quantizer analog gain is controlled to be a first gain value. When a second PWM drive voltage swing range is supplied to the speaker driver, the analog gain is controlled to be a second gain value. The first and second gain values of the analog gain of the quantizer cause the combined gain of the quantizer and driver to be approximately equal in the two modes. The quantizer has at least two gain-affecting measurable non-ideal characteristics. The quantizer is adjustable using measured first and second values to correct for first and second of the at least two non-ideal characteristics. The gain of the quantizer is calibratable while the quantizer is adjusted using the measured first and second measured values.
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