The circuit of Fig. P3.80 illustrates the application of a CMOS inverter as an inverting amplifi er. The function of the negative-feedback resistance R2 is to bias the FETs at VO 5 VI , that of R1 is...

The circuit of Fig. P3.80 illustrates the application of a CMOS inverter as an inverting amplifi er. The function of the negative-feedback resistance R2 is to bias the FETs at VO 5 VI , that of R1 is to set the closed-loop gain ideally at 2R2yR1, and that of C is to ac-couple the input source to the amplifier without disturbing its dc operating point. Assume matched FETs, each having gm 5 1 mA/V and ro 5 100 kV. If R1 5 200 kV, R2 5 1.0 MV, and vsig 5 (100 mV)cos t, estimate vo and vi as well as the open-loop gain voyvi and the closed-loop gain voyvsig. How does the latter compare with its ideal value?