Amplifier circuit

H - Electricity – 03 – F

Patent

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Details

H03F 1/02 (2006.01)

Patent

CA 2711022

An amplifier circuit comprises an input, for receiving an input signal to be amplified; a preamplifier, for amplifying the input signal based on a variable gain; a power amplifier for amplifying the signal output from the preamplifier; and a variable voltage power supply for supplying one or more supply voltages to the power amplifier. The supply voltages are adjusted based on the variable gain or the input digital signal. According to other aspects of the invention, a power supply of an amplifier circuit is clocked using a clock signal, whereby the clock signal has a frequency that varies in accordance with a volume signal or an input signal.

L'invention concerne un circuit d'amplificateur comprenant : une entrée pour recevoir un signal d'entrée devant être amplifié, un préamplificateur pour amplifier le signal d'entrée sur la base d'un gain variable, un amplificateur de puissance pour amplifier le signal de sortie du préamplificateur et une alimentation à tension variable pour fournir une ou plusieurs tensions d'alimentation à l'amplificateur de puissance. Les tensions d'alimentation sont ajustées sur la base du gain variable ou du signal numérique d'entrée. Selon d'autres aspects de l'invention, une alimentation d'un circuit d'amplificateur est rythmée à l'aide d'un signal d'horloge, le signal d'horloge ayant une fréquence qui varie en fonction d'un signal de volume ou d'un signal d'entrée.

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