AMPLIFIER CIRCUIT AND METHOD OF AMPLIFYING A SIGNAL IN AN AMPLIFIER CIRCUIT
First Claim
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.
4 Assignments
0 Petitions
Accused Products
Abstract
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.
-
Citations
20 Claims
-
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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
-
18. A method of amplifying a signal in an amplifier circuit, said amplifier circuit comprising an amplifier and a switched power supply, said method comprising:
-
receiving an input signal; providing at least one supply voltage from the switched power supply to the amplifier, said step of providing comprising; switching the switched power supply at a switching frequency; and on the basis of a control signal, dithering the switching frequency; and amplifying the input signal in the amplifier; 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. - View Dependent Claims (19)
-
-
20. An amplifier circuit comprising:
-
a switched power supply for supplying at least one supply voltage to an amplifier; and a controller operable to dither a switching frequency of the switched power supply; wherein the dither of the switching frequency varies based on an indication of amplitude of a signal being amplified by the amplifier.
-
Specification