Amplifier and amplifier control method

摘要

Disclosed is a class D amplifier comprising a modulation stage having a first input for receiving an input signal and an output for producing a modulated version of the input signal; a plurality of power stages, each power stage being responsive to said modulation stage and comprising a first switch and a second switch coupled in series between a first voltage source and a second voltage source, each power stage comprising an output node between the first switch and the second switch; and a power stage control circuit for measuring the input signal level and enabling a selected number of the power stages as a function of the measured input signal level. A method for controlling such a class D amplifier is also disclosed.

主权项

1. An amplifier comprising:
a modulation stage having an input configured to receive an input signal, and an output configured to provide a modulated version of the input signal; a plurality of power stages, each power stage being responsive to said modulation stage and comprising a first switch and a second switch coupled in series between a first voltage source and a second voltage source, each power stage comprising an output node between the first switch and the second switch; and a power stage control circuit configured to compare the input signal level to fractions of a reference signal, wherein each respective fraction corresponds to a different power stage, and enable a selected number of the power stages as a function of the measured input signal level.