PAPER SESSION 3: METHODS AND TOPOLOGIES



Digital Control of a PWM Switching Amplifier with Global Feedback


Toit Mouton(1), Bruno Putzeys(2).
(1) University of Stellenbosch, Western Cape, South Africa. (2) Hypex Electronics B.V., Groningen, The Netherlands.


A digitally-controlled class-D amplifier using global feedback is presented. The output signal of the amplifier is sampled using a sigma-delta analog-to-digital converter. A novel compensation strategy is used to minimize distortion resulting from ripple feedback of the output signal. An evaluation system, based on a Field Programmable Gate Array, was developed and an experimental evaluation was performed. State-ofthe- art performance was achieved.


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