Sep 30, 2008 #1 sykab Member level 2 Joined Apr 26, 2008 Messages 44 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,286 Activity points 1,579 Is 31 dB a good value for an OPAMP's PSRR?
Sep 30, 2008 #2 PaloAlto Full Member level 4 Joined Oct 8, 2007 Messages 194 Helped 35 Reputation 70 Reaction score 10 Trophy points 1,298 Location Cádiz, Spain Activity points 2,506 Re: PSRR It doesn't sound too impressive. You can calculate it yourself. 31dB is a gain of 35. How much error can you accept in your output signal? e.g. If your max error is 1mV, that means that your supply ripple should be lower than 35mV. Is that possible? Again, it sounds a little bit scarce
Re: PSRR It doesn't sound too impressive. You can calculate it yourself. 31dB is a gain of 35. How much error can you accept in your output signal? e.g. If your max error is 1mV, that means that your supply ripple should be lower than 35mV. Is that possible? Again, it sounds a little bit scarce
Oct 5, 2008 #3 D drabos Full Member level 6 Joined Jan 3, 2006 Messages 397 Helped 45 Reputation 90 Reaction score 15 Trophy points 1,298 Activity points 3,768 PSRR It is a very poor PSRR...
Oct 9, 2008 #4 W windgoal Newbie level 3 Joined Oct 9, 2008 Messages 4 Helped 1 Reputation 2 Reaction score 0 Trophy points 1,281 Activity points 1,301 Re: PSRR It depents on the application where you use this Opamp, and the frenquency where you get this 31dB value. For a positive supply, working as to audio/video's supplier, it's not too bad. And if PSRR=31dB under f=10MHz, it's a little impressive!
Re: PSRR It depents on the application where you use this Opamp, and the frenquency where you get this 31dB value. For a positive supply, working as to audio/video's supplier, it's not too bad. And if PSRR=31dB under f=10MHz, it's a little impressive!
Oct 11, 2008 #5 W wizard of oz Newbie level 5 Joined Aug 13, 2005 Messages 10 Helped 2 Reputation 4 Reaction score 0 Trophy points 1,281 Activity points 1,331 PSRR 31dB at what frequency? At low frequencies 50-60db is more or less the norm for cascoded opamps. Howevere depedning on the opamp can fall very quickly at high frequnecies.
PSRR 31dB at what frequency? At low frequencies 50-60db is more or less the norm for cascoded opamps. Howevere depedning on the opamp can fall very quickly at high frequnecies.