AMPLIFIER CIRCUIT AND METHOD OF AMPLIFYING A SIGNAL IN AN AMPLIFIER CIRCUIT

摘要

An amplifier circuit, comprising: an input, for receiving an input signal to be amplified; a power amplifier, for amplifying the input signal; a switched power supply, having a switching frequency, for providing at least one supply voltage to the power amplifier; and a dither block, for dithering the switching frequency of the switched power supply. The dither block is controlled based on the input signal. Another aspect of the invention involves using first and second switches, each having different capacitances and resistances, and using the first or second switch depending on the input signal or volume signal. Another aspect of the invention involves controlling a bias signal provided to one or more components in the signal path based on the input signal or volume signal.

主权项

1. An amplifier circuit, comprising:
an input, for receiving an input signal to be amplified; an amplifier, for amplifying the input signal; a switched power supply, having a switching frequency, for providing at least one supply voltage to the amplifier; and a dither block, for dithering the switching frequency of the switched power supply; wherein the dither block is controlled based on a control signal, wherein the control signal is based on at least one of the input signal and a volume signal for controlling a variable gain applied to the input signal.