themaccabee
Full Member level 4
Hi,
I want to know one thing about a 3 op-amp Instrumentation amplifier circuit diagram below
I understand that the CMRR of the circuit is very much dependent upon the matching of the resistors R4,R5,R6,R7 provided the XOP1 &XOP2 are matched well.
Im putting R4=R5=R6=R7 =x ,same value & Gain is introduced in the first stage only.
Now Im varying x=10K to 100K.. giving all the resistors(R4,R5,R6,R7) one value at a time.
So what will be its effect on CMMR??Will CMRR be affected..If so why?, can somebody explain..?
Thanks for any help
Regards
I want to know one thing about a 3 op-amp Instrumentation amplifier circuit diagram below
I understand that the CMRR of the circuit is very much dependent upon the matching of the resistors R4,R5,R6,R7 provided the XOP1 &XOP2 are matched well.
Im putting R4=R5=R6=R7 =x ,same value & Gain is introduced in the first stage only.
Now Im varying x=10K to 100K.. giving all the resistors(R4,R5,R6,R7) one value at a time.
So what will be its effect on CMMR??Will CMRR be affected..If so why?, can somebody explain..?
Thanks for any help
Regards