themaccabee
Full Member level 4
Hi ,
I need to do a simulation showing that the resistors in the second stage of a 3 opamp instrumentation amplifier greatly affect the CMRR while the resistors in the first stage doesnt.
As per some suggestions im looking onto Monte carlo analysis..Im hoping that its the right way to do it.
I ve done a simulation with 10K, 1% tolerance & 10% lot tolerance for resistors in second stage for this circuit and i got a histogram output from pspice 9.1..
Now
1)I dont understand the Histogram completely..(the Y axis is in Volts)
2)Shall i take the mean output voltage and use it to calculate the worst case CMRR?
3)Then i should do a similar analysis with first stage resistors and calulate the worst case CMRR in a similar way?
I need to do a simulation showing that the resistors in the second stage of a 3 opamp instrumentation amplifier greatly affect the CMRR while the resistors in the first stage doesnt.
As per some suggestions im looking onto Monte carlo analysis..Im hoping that its the right way to do it.
I ve done a simulation with 10K, 1% tolerance & 10% lot tolerance for resistors in second stage for this circuit and i got a histogram output from pspice 9.1..
Now
1)I dont understand the Histogram completely..(the Y axis is in Volts)
2)Shall i take the mean output voltage and use it to calculate the worst case CMRR?
3)Then i should do a similar analysis with first stage resistors and calulate the worst case CMRR in a similar way?