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13 Threads found on Cmrr Test
I haven't really seen many fully differential amplifiers with single ended outputs. What I meant is, you can use a standard fully differential amplifier with only one output connected. You should consider that many differential amplifier application don't need very high cmrr. Single OP differential amplifiers are often sufficient
Hello every one, I have attached design of programmable OTA. but i dont know how to measure parameters like gain, phase, cmrr, PSRR, slew rate etc. To measure all this parameters i have used one test bench which is also attached here. But problem is that i have measured gain in db, which is negative and phase is also negative. In test (...)
I don't understand how this circuit works In allen's book, it is used to measure cmrr but i don't understand how it works...i don't understand why Vicm is the common mode voltage for opamp under test...the common mode voltage is ((V+)+(V-))/2 and not the voltage applied to Vdd,Vss,Vout...can you help me? thanks
for a full differential gain-boosted opamp,which parameters should be tested?such as gain,PM,GBW(main opamp \ gain-boost opamp \ cmfb circuit),PSRR,cmrr,offset and so on.any other needed? besides,another question,how to test the above parameters,especially for PSRR,cmrr , offset and any other important parameters? are (...)
You need what they call a null amp circuit for offset, open loop gain or cmrr tests. Here is a link:
I knew nothing about circuit test I wanna know how to test the parameters of the circuit such as , Vos, cmrr, etc.. if anyone know some information about it please show me thanks a lot!
As usual I'd like to ask what frequency your measurement is concerned. Is it single ended or differential? DC test is simple. For high frequency, a modern 4-port network analyzer shall serve your need well if you are not testing DC and extremely high Zin. Convert the Sdd11 to Zdd11 and use cmrr=Sdd21/Sdc21 if your ckt uses four port (...)
The easiest way to do that is by shorting both input and apply a variable DC voltage to both throu the full range of input voltage. Monitor the output for each applied DC input. The result of A=20*log(Vo/Vi) will be cmrr curve in dB.
For a single ended opamp,the unity-gain configuration is the output connects the negative input .Using such configurationg ,we can simulate psrr,cmrr,and so on . My question is , for differential output opamp,how to connect the circuit in order to form the unity-gain configuration?And how to simulate psrr,cmrr??? Anyone can draw it?
is there some way to test(not simulation,use in bench test) the cmrr,PSRR & THD of the full diff opa? thanks a lot.
How to measure the SR and cmrr of a full-differential opamp? In Allen's book,only single-out opamp is discussed. Where can I find these informations? THX
dear everyone: how can i test the input/output capacitance of the folded cascode OTA with HSPICE? and if sombody have materials about how to use hspice for these applies testing iuput /output capacitance,loop gain,psrr,cmrr,i/o impedance,transconductance,gain at low frequency and so on,please give me. thanks regards (...)
Hi all, can anyone here suggest me a test method that can plot the OPA's cmrr in frequency response? thanks so much in advance regards,