What is the maximum allowable differential output voltage swing that maintains M1 and M2 operating in saturation? Hint: To find the threshold voltage of M1/M2 accounting for body effect, set up the equations for Vt and for Vss in terms of Vt, and solve numerically to find a value that satisfies both expressions.

In the given circuit, (W/L)1=(W/L)2=50/0.5, Vdd=3.0V, Iss=0.5mA, input common-mode level Vcm=1.2V.

 

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FET Parameters Parameter μCox INP Y A V₁0 LD PHI www > Ro M1 D OUTN Consider the differential-pair circuit diagram shown below, with process parameters listed in the table above. Be sure to account for body-effect as needed. Vb Vdd Vss M3 D NFET 120 0.45 Iss 0 0.7 0 0.9 Ro OUTP ww DM2 G PFET 40 0.4 INn 0 -0.8 0 0.8 Units μA/V² √V 1/V V μm V FET Parameters Parameter μCox INP Y A V₁0 LD PHI www > Ro M1 D OUTN Consider the differential-pair circuit diagram shown below, with process parameters listed in the table above. Be sure to account for body-effect as needed. Vb Vdd Vss M3 D NFET 120 0.45 Iss 0 0.7 0 0.9 Ro OUTP ww DM2 G PFET 40 0.4 INn 0 -0.8 0 0.8 Units μA/V² √V 1/V V μm V

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