Sep 9, 2005 #1 H holddreams Full Member level 6 Joined Aug 2, 2005 Messages 351 Helped 15 Reputation 30 Reaction score 7 Trophy points 1,298 Location Shanghai Activity points 4,237 How to draw the PSRR curve for a opamp in COSMOSSCOPE? When use hspice ,the output vdb(out) is 1/PSRR, so how can i get the psrr?
How to draw the PSRR curve for a opamp in COSMOSSCOPE? When use hspice ,the output vdb(out) is 1/PSRR, so how can i get the psrr?
Sep 9, 2005 #2 F flushrat Full Member level 3 Joined Jan 25, 2005 Messages 180 Helped 23 Reputation 46 Reaction score 8 Trophy points 1,298 Activity points 1,532 some books define vdb(vo/vdd) as psrr but others define vdb(vdd/vo) as psrr the only difference of psrr in db format is the sign so you can just plot vdb(vout) or -vdb(vout) as you like
some books define vdb(vo/vdd) as psrr but others define vdb(vdd/vo) as psrr the only difference of psrr in db format is the sign so you can just plot vdb(vout) or -vdb(vout) as you like
Sep 9, 2005 #3 X xwcwc1234 Full Member level 5 Joined Jul 21, 2001 Messages 284 Helped 7 Reputation 14 Reaction score 1 Trophy points 1,298 Activity points 1,753 You can refer the book "CMOS analog circuit design" by P.E.Allen, there are some examples explain this problem.
You can refer the book "CMOS analog circuit design" by P.E.Allen, there are some examples explain this problem.
Sep 17, 2005 #4 S starcoming Member level 1 Joined Sep 8, 2005 Messages 40 Helped 2 Reputation 4 Reaction score 1 Trophy points 1,288 Activity points 1,630 you can depict 1/PSRR in dB mode. Then you can easily image the PSRR picture.
Sep 17, 2005 #5 H holddreams Full Member level 6 Joined Aug 2, 2005 Messages 351 Helped 15 Reputation 30 Reaction score 7 Trophy points 1,298 Location Shanghai Activity points 4,237 thanks