question about r1 of aleph30

john-china · 14th August 2003, 09:13 AM

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

jh6you · 15th August 2003, 01:00 AM

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

Nelson Pass · 15th August 2003, 08:56 PM

R1 injects a tiny amount of power supply noise into
the circuit out of phase, reducing the noise and increasing
the PSRR.

14th August 2003, 09:13 AM	#1
john-china diyAudio Member Join Date: Feb 2001 Location: where fair living	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 __________________ Maybe i should not be lazy again

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15th August 2003, 01:00 AM	#2
jh6you Account Disabled Join Date: Aug 2002 Location: Near to the Pacific Ocean	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

15th August 2003, 08:56 PM	#3
Nelson Pass The one and only Join Date: Mar 2001	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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