6.4 Suppose that the resistive-load inverter examined in Exercise 6.2 is conneceted t a load capacitance of 1.0 pF which is initially discharged. The gate of the nMOS transistor is driven by a rectangular pulse which changes from high to low at t = 0. As a result, the nMOS transistor begins to charge up the capacitor. Solve the following two parts by using the differential equations and not by using the average-current methods. The following parameters are given:
• R = 20kΩ
• µn·Cox = 20 µA/V2
• W/L = 15
• VT = 1.0 V
(a) Determine the 50% low-to-high delay time which is defined as the time difference between 50% points of input and output waveforms when the output waveform switches from low to high.
(b) Determine the 50% high-to-low delay time which is defined as the time difference between 50% points of input and output waveforms when the output waveform switches from high to low when the capacitor is initially charged to 5.0V.
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