1. For the grounded gate p-pullup pseudo NMOS circuit shown below assume the load capacitor, CL, is initially discharged, and that the input voltage abruptly drops from Vdd to zero. Derive the equation for the output voltage charging behavior. Estimate the rise time to 90% of Vdd at the output.
2. Now raise the input voltage abruptly to Vdd and derive the output Voltage waveform as the voltage declines from 90% of Vdd to 10% of Vdd.