| question about r1 of aleph30 - Click HERE for Original Thread |
| john-china |
| 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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| jh6you |
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
:yinyang: |
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| Nelson Pass |
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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