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Obtaining 120dB Performance Using Switching Power Supplies

There is a growing tendency to use switching power supplies to reduce costs. Many designers believe that switching supplies and high performance are mutually exclusive. With some careful design considerations, it is possible to optimize performance using switching power supplies. This paper will review selection of optimal switching frequency. The tradeoffs of switching frequency and efficiency, which are typical in high performance systems, will be examined. Measurement results using asynchronous audio switching clocks will be presented. Measurement results of synchronizing power supply switching to audio clocking multiples will demonstrate how to achieve 120dB performance, the current high benchmark for professional audio systems.

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