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because pmos has low mobility . the inverter threshold voltage can be shifted to the middle and the inverter is more symmetrical in terms of transistor times.

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What are the differences between nmos and pmos transistors?

NMOS is built with n-type source and drain and a p-type substrate, while PMOS is built with p-type source and drain and a n-type substrate. In a NMOS, carriers are electrons, while in a PMOS, carriers are holes. When a high voltage is applied to the gate, NMOS will conduct, while PMOS will not. Furthermore, when a low voltage is applied in the gate, NMOS will not conduct and PMOS will conduct. NMOS are considered to be faster than PMOS, since the carriers in NMOS, which are electrons, travel twice as fast as holes, which are the carriers in PMOS. But PMOS devices are more immune to noise than NMOS devices. Furthermore, NMOS ICs would be smaller than PMOS ICs (that give the same functionality), since the NMOS can provide one-half of the impedance provided by a PMOS (which has the same geometry and operating conditions).


Why are pmos larger than nmos in cmos design?

PMOS transistors are typically larger than NMOS transistors in CMOS design because the mobility of holes (the charge carriers in PMOS) is lower than that of electrons (the charge carriers in NMOS). This means that a larger current-carrying area is needed in the PMOS to achieve the same performance as the NMOS transistor. By making the PMOS larger, designers can balance the drive strengths of the two types of transistors in a CMOS circuit.


Why Pmos transistor is usually larger than Nmos transistor in layout?

The Pmos transistor is typically larger than the Nmos transistor in layout due to differences in carrier mobility and threshold voltage between P-type and N-type semiconductor materials. Pmos transistors have lower carrier mobility and higher threshold voltage compared to Nmos transistors, requiring larger sizes to achieve similar performance levels. Additionally, the larger size helps to balance the drive strengths of Pmos and Nmos transistors in a circuit design for optimal operation.


Why P-type semiconductors mosfet are not use generally?

in case p type semiconductor mosfet the carriers are holes whose mobility is much less then electrons hence they are not used. when mosfets were introduced originally PMOS was much more common than NMOS, because process for PMOS devices was simpler. but as process methods improved things transitioned to NMOS due to higher speed of operation due to greater carrier mobility (as explained above) and eventually CMOS due to lower power consumption. The same was true for similar reasons with bjts: PNP was easier to make but NPN was faster.


Which encounters the greater force of air resistance a falling elephant or a falling feather?

A falling elephant encounters a greater force of air resistance than a falling feather does. The force of air resistance can't be greater than the weight of the falling object. When the force of air resistance is equal to the weight of the falling object, the object stops accelerating, its falling speed becomes constant, and the force of air resistance doesn't get any bigger. So the force of air resistance against a falling feather can't be greater than the weight of the feather. But the force of air resistance against a falling elephant can be, and undoubtedly is, greater than the weight of a feather.


Which material has a greater resistance aluminum or copper wire?

Copper wire has greater resistance than aluminum wire. This is because copper is a better conductor of electricity than aluminum. This means that copper wire will have less resistance and will be able to carry more current with less energy loss.


How will a shunt generator behave if the field resistance is greater than the critical resistance?

the shunt generator wont be started .hehe


What happen to the current when the voltage is greater than or equal to 6 volts?

The current is greater than or equal to (6) divided by (the effective resistance of the circuit).


Which direction does the parachutist go if gravity is greater than air resistance?

The parachutist will go down, of course. If gravity is greater than air resistance, then the parachutist would accelerate (his speed would increase). This would increase air resistance, up to the point where gravity and air resistance are in balance.


Is the resistance in the start winding greater or less than the resistance in the run winding?

The resistance in the start winding is greater because it is longer and thinner and has the greatest resistance to current flow


When air resistance is greater than force of gravity what will be the effect of force?

When air resistance is greater than the force of gravity acting on an object, it will slow down the object's descent. This is because the air resistance force counteracts the force of gravity, reducing the acceleration of the object as it falls.


What will happen to voltage divider circuit if emitter resistance is greater than collector resistance?

The gain of a class A, common emitter BJT amplifier, a fairly standard configuration, is defined as collector resistance divided by emitter resistance, or as hFe, whichever is less. Assuming that we are operating in a linear mode, and hFe is not a limiting factor, then the emitter resistance being greater than the collector resistance simply means that the gain is less than one.