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What is the maximum current dissipation for a CMOS inverter?
the maximum current dissipation for our CMOS inverter is less than 130uA. Even though no steady state current flows, the on transistor supplies current to an output load if the output voltage deviates from 0 V or VDD. This makes CMOS technology useable in low power and high-density applications.
Why are CMOS inverters important in circuit design?
Conclusion The CMOS inverter is an important circuit device that provides quick transition time, high buffer margins, and low power dissipation: all three of these are desired qualities in inverters for most circuit design. It is quite clear why this inverter has become as popular as it is.
What is the drain current of a nMOS inverter?
The following graph shows the drain to source current (effectively the overall current of the inverter) of the NMOS as a function of input voltage. Note that the current in the far left and right regions (low and high VIN respectively) have low current, and the peak current in the middle is only .232mA (a 1.16mW power dissipation).
Why are CMOS inverters good for logic buffers?
Furthermore, the CMOS inverter has good logic buffer characteristics, in that, its noise margins in both low and high states are large. This short description of CMOS inverters gives a basic understanding of the how a CMOS inverter works.
Where does Region IV of the nMOS inverter occur?
Region IV occurs between an input voltage slightly higher than VM but lower than VDD-VTP. Now the NMOS device is conducting in the linear region, dropping a low voltage across VDS. Since VDS is relatively low, the PMOS device must pick up the tab and drop the rest of the voltage (VDD-VDS) across its VSD junction.
Which is the drain current through the NMOS device?
The drain current (ID) through the NMOS device equals the drain current through the PMOS device at all times. MOSFET gates have a high input impedance and we assume the circuit’s output sees no significant loading.
How are MOSFETs to be matched for optimum operation?
The MOSFETS must be perfectly matched for optimum operation, that is, they must have the same threshold voltage magnitude and conduction parameter. The drain current (ID) through the NMOS device equals the drain current through the PMOS device at all times.