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Home > 6.ISSUES > Power Supply Effects on Noise Performance

Power Supply Effects on Noise Performance

Executive Summary

PSRR is an often misunderstood and little used specification. Understanding the PSRR (Power Supply Rejection Ratio) of analog circuits is an important step toward improving overall mixed-signal system performance. The fact is that the PSRR of analog circuits, including ADCs (Analog-to-Digital Convert- ers), DACs (Digital-to-Analog Converters) and op amps, is usually much worse at high frequencies than the DC PSRR generally seen on data sheets. However, most manufacturers have historically only specified DC PSRR. While this applica- tion note concerns itself with Analog-to-Digital Converters, it applies equally as well to Digital-to-Analog Converters, am- plifiers and to circuits in general, integrated or otherwise.

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