Patent ID: 6016075
Filing Date: 2000-01-18
Classification: H03F

Abstract:
An audio amplifier comprising:(a) a first section having at least one audio signal input port to which a respective audio input signal to be amplified is applied;(b) a second section having a first monolithic device forming an integrated circuit coupled to said respective audio input port to receive said respective audio input signal, coupled to at least one feedback network to receive a respective feedback signal from the respective output of said audio amplifier, and adapted to produce at least one Pulse Width Modulated square wave signal;(c) a third section embodied in a second monolithic device forming a second integrated circuit having:(i) at least one Pulse Width Modulated square wave signal input port;(ii) at least two square wave signal output ports;(iii) at least two field effect transistor (FET) driver circuits connected to said respective Pulse Width Modulated square wave signal input port to receive a respective Pulse Width Modulated square wave signal and develop therefrom a respective square wave FET switching signal directed to a respective said square wave signal output port;(d) a fourth section having at least one FET operated switching circuit with at least two FETs wherein each of said FETs is connected to a corresponding respective square wave signal output port, each said respective FET being operative in response to a respective said square wave FET switching signal being received on the respective said square wave signal output to which said respective FET connected to switch sequentially and produce therefrom as an output of each said respective FET operated switching circuit a respective amplified square wave signal; said fourth section being adapted for use in conjunction with a proscribed number of external power sources;(e) a fifth section having:(i) at least one filter circuit connected to receive and filter said respective amplified square wave signal, and produce therefrom a respective continuous amplified audio signal;(ii) at least one audio speaker connected to receive said respective continuous amplified audio signal and produce a respective audible signal therefrom;(f) said respective feedback network is coupled to said respective filter circuit and said respective audio input port for transmitting said respective feedback signal in which the formation of said respective Pulse Width Modulated square wave signal depends; andwherein said first and second sections and the components thereof are embodied in a single integrated circuit adapted on its input side to receive said respective audio input signal and said respective feedback signal, and on its output side having connections to said respective FET switching circuit.