I have a question regarding a cascading OpAmp of 1 inverting to a summing? amplifier, the input V1 is 150mV and V2 is 60mV, i know how to calculate without the +0.5V at the Summing + input,
Vo1 = (-Rf/R)Vin = (-120K/47K)V2 for 1st stage,
then Vo2 = (-Rf/R1)V2 - (Rf/R2)V1 = (-33K/10K)Vo1-(33K/22K)V1 = 0.28V
but when applying +0.5V at the Summing + input, my multisim simulation get 3.188V.
can someone show me the formula including the 0.5V input?
**broken link removed**
Vo1 = (-Rf/R)Vin = (-120K/47K)V2 for 1st stage,
then Vo2 = (-Rf/R1)V2 - (Rf/R2)V1 = (-33K/10K)Vo1-(33K/22K)V1 = 0.28V
but when applying +0.5V at the Summing + input, my multisim simulation get 3.188V.
can someone show me the formula including the 0.5V input?
**broken link removed**