Transcription of Understanding power supply ripple rejection in linear ...
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Understanding power supply ripple rejection in linear ...
8 Analog Applications JournalAnalog and Mixed-Signal 2005 Understanding power supply ripple rejection in linear regulatorsPower supply ripple rejection ratio (PSRR) is a measure ofhow well a circuit rejects ripple coming from the inputpower supply at various frequencies and is very critical inmany RF and wireless applications. In the case of an LDO,it is a measure of the output ripple compared to the inputripple over a wide frequency range (10 Hz to 10 MHz iscommon) and is expressed in decibels (dB). The basicequation for PSRR isMore specifically, PSRR for an LDO can be written aswhere AVis the open-loop gain of the regulator feedbackloop, and AVOis the gain from VINto VOUT with the regula-tor feedback loop open.
bandgap with a low-pass filter (LPF). This LPF is almost always accomplished with a large internal resistor and an external capacitor. The effect of the LPF can be seen in Region 1 of Figure 2, where the PSRR is somewhat reduced because the LPF passes bandgap ripple in this frequency range. As has been shown, there are many ways to improve the
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