Please be DESCRIPTIVE and thorough to recieve the points 1) How do you measure V
ID: 1814114 • Letter: P
Question
Please be DESCRIPTIVE and thorough to recieve the points
1) How do you measure VM, VOH and VOL? How do you measure VIL and VIL and why is this method used?
2) Identify the noise margins (NML and NMH) on the voltage transfer characteristic. Why are these useful?
3) Draw the power supply current as a function of the input voltage for a CMOS inverter. What is the current when the input is at VOH? What transistor causes this? What is the current when the input is at VOL? What transistor causes this? What is the dc power of the CMOS inverter?
Explanation / Answer
We are given both load line plots for the active NMOS device and the non-linear device of the shaded box. How do we link the information provided by these curves to generate information about input and output voltages? First, we need to realize that the output voltage of the NMOS device determines what the voltage drop across the shaded box. That is,
Vout = VDS = VDD