Return Ratio Analysis

[ccw27]

Can someone help me derive the direct signal feedthrough transfer function, variable d, on the circuit below at high frequency? (This was taken from Prof. Murmann lecture at Stanford)

Thanks

 

[jasmin_123]

It is simple:

D=vo/vin for Gm=0:

D=[Zcs+Zcx//(Zcf+Ro//Zcl)]*[Zcx/(Zcx+Zcf+Ro//Zcl)]*(Ro//Zcl)

d=D*[1+T(s)]