Mar 31, 2020 #1 S satiz Member level 5 Joined Jun 9, 2013 Messages 87 Helped 3 Reputation 6 Reaction score 3 Trophy points 1,288 Activity points 1,999 My CMRR value is 90dB. Can anyone explain to convert this in numerical value.
Mar 31, 2020 #2 S std_match Advanced Member level 4 Joined Jul 9, 2010 Messages 1,304 Helped 463 Reputation 926 Reaction score 448 Trophy points 1,363 Location Sweden Activity points 10,169 90 dB = 20 * log(voltage_ratio) => voltage_ratio = 10^(90/20) = 31623 The output will change max 1/31623 of the input common mode change. In this case about 32uV/V You can also get this directly by going from out/in = -90 dB = 10^(-90/20) = 32u
90 dB = 20 * log(voltage_ratio) => voltage_ratio = 10^(90/20) = 31623 The output will change max 1/31623 of the input common mode change. In this case about 32uV/V You can also get this directly by going from out/in = -90 dB = 10^(-90/20) = 32u
Mar 31, 2020 #3 S srizbf Advanced Member level 5 Joined Apr 3, 2010 Messages 1,992 Helped 417 Reputation 840 Reaction score 329 Trophy points 1,363 Activity points 10,985 satiz said: My CMRR value is 90dB. Can anyone explain to convert this in numerical value. Click to expand... 20*log(x)=90dB so , x is 31633.
satiz said: My CMRR value is 90dB. Can anyone explain to convert this in numerical value. Click to expand... 20*log(x)=90dB so , x is 31633.
Mar 31, 2020 #4 KlausST Advanced Member level 7 Joined Apr 17, 2014 Messages 25,155 Helped 4,868 Reputation 9,757 Reaction score 5,535 Trophy points 1,393 Activity points 168,328 Hi, What about doing an internet search on your own: "online dB calculator"... Klaus
Apr 11, 2020 #5 S satiz Member level 5 Joined Jun 9, 2013 Messages 87 Helped 3 Reputation 6 Reaction score 3 Trophy points 1,288 Activity points 1,999 Online calculator gives me the results. But Mr.std_match explanation is very much useful to understanding better way
Online calculator gives me the results. But Mr.std_match explanation is very much useful to understanding better way