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Title : MT-043: Op Amp Power Supply Rejection Ratio (PSRR) and Supply Voltages
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Date : 25-Mar-2009
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If the supply of an op amp changes, its output should not, but it typically does. If a change of X volts in the supply produces an output voltage change of Y volts, then the PSRR on that supply (referred to the output, RTO) is X/Y. The dimensionless ratio is generally called the power supply rejection ratio (PSRR), and Power Supply Rejection (PSR) if it is expressed in dB.
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