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The ideal long channel nMOSFET and pMOSFET devices shown in the circuits have threshold voltages of 1 V and −1 V ...

 

The ideal long channel nMOSFET and pMOSFET devices shown in the circuits have threshold voltages of 1 V and −1 V, respectively. The MOSFET substrates are connected to their respective sources. Ignore leakage currents and assume that the capacitors are initially discharged. For the applied voltages as shown, the steady state voltages are _________________.


Answer: for nMOSFET, Vgs ≥ Vth  Or, (Vg - Vs) ≥ Vth

So, the maximum output voltage is limited to Vg - Vth or 5-1 = 4V


For nMOSFET, Vgs  less than or equal to Vth  Or, (Vg - Vs) <= Vth

If you were using a pMOS to pull an output down to ground (passing a "0"), it would be limited. It would turn off once the output reached: Vout,min =Vg + |Vth| or, 5V


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