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AN1042

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ON Semiconductor ON-Semiconductor

High Fidelity Switching Audio Amplifiers Using TMOS Power MOSFETs

Almost all switching amplifiers operate by generating a high frequency square wave of variable duty cycle. This square wave can be generated much more efficiently than an analog waveform. By varying the duty cycle from 0 to 100%, a net dc component is created that ranges between the negative and positive supply voltages. A low pass filter delivers this dc component to the speaker. The square wave must be generated at a frequency well above the range of hearing in order to be able to cover the full audio spectrum from dc to 20 kHz. Figure 1 shows a square wave generating a sine wave of one–ninth its frequency as its duty cycle is varied.

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TMOS Power MOSFETs
Motorola => Freescale
HIGH FIDELITY CLASS D AUDIO AMPLIFIER SOLUTION
Zetex => Diodes
HIGH FIDELITY CLASS D AUDIO AMPLIFIER SOLUTION
Zetex => Diodes
High Fidelity, Low Power, Integrated Stereo Audio Amplifier
Analog Devices
HIGH FIDELITY Power Speech
Winbond
High-fidelity Digital Audio, Multi-function Digital Filter
Nippon Precision Circuits
HIGH FIDELITY PowerSpeech™
Winbond
HIGH FIDELITY PowerSpeech™
Winbond
TMOS Switching
New Jersey Semiconductor
TMOS Switching
Motorola => Freescale

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