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Old 14th August 2003, 09:13 AM   #1
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Default question about r1 of aleph30

Mr. pass said r1 is for power supply rejection . but i dont understand it because my english is poor, can anyone explain it for me in detail? thanks
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Old 15th August 2003, 01:00 AM   #2
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The power supply rejection ratio (PSRR) is the measure of how well the regulator rejects an AC signal
riding on a nominal input DC voltage. This definition is self-explanatory about what is the power
supply rejection. And, R1 must be for a better rejection.

This would help in detail: http://www.maxim-ic.com/appnotes.cfm/appnote_number/883

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Old 15th August 2003, 08:56 PM   #3
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R1 injects a tiny amount of power supply noise into
the circuit out of phase, reducing the noise and increasing
the PSRR.
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