Low-noise current-in class D amplifier with slew rate control mechanism
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United States of America Patent
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Aug 28, 2018
Grant Date -
Jan 18, 2018
app pub date -
Jun 22, 2017
filing date -
Jul 15, 2016
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Abstract
A circuit applied to speaker includes a tri-level current DAC and a class D amplifier. The current DAC is arranged to receive a digital signal to generate a current signal, and the class D amplifier is arranged to directly receive the current from the current DAC and to amplify the current signal to generate an output signal. SNR performance is well improved class D amplifier due to small signal noise reduced by preceding tri-level DAC. In addition, the circuit further includes a driving stage, and a gate-drain voltage of a power transistor within the driving stage can be controlled to set the appropriate slew rate.
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