VCM driver and PWM amplifier
作者： Hiroshi Kuroiwa , Yasuhiko Kokami
DOI:
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摘要: The present invention provides a VCM driver realizing low power consumption and high accuracy PWM amplifier compensating dead time distortion. A phase compensator, ΔS modulator receiving an output signal of the compensator converting to control code predetermined bits, produce signal, circuit drive voice coil constitute forward path. sense sensing current coil, ADC amplifier, low-pass filter ADC, decimation feedback An is fed back input side form major loop having first-order characteristic gain. minor gain which flat until target band frequency when viewed from compensator.
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