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* reduce the complexity of the circuit
* low static power consumption
* high noise immunity
* high density of logic function on a chip
The most important advantage of CMOS is the very low static power consumption in compare with NMOS technology. On the other hand, CMOS technology is more complex to fabricate then NMOS technology, so it is more expensive. However, almost every todays digital circuits are CMOS. You want to use NMOS only when you want to fabricate fast and low-cost a simple circuit. The most important advantage of CMOS is the very low static power consumption in compare with NMOS technology. On the other hand, CMOS technology is more complex to fabricate then NMOS technology, so it is more expensive. However, almost every todays digital circuits are CMOS. You want to use NMOS only when you want to fabricate fast and low-cost a simple circuit.
Power consumption and hence heat dissipation. Complimentary Metal On Silicon is well proven, switch on typically 2.4V with very little energy, and being so well known, also allows very high gate density.
Please contest this on the discussion pages, and not by editing the answer. I know you can argue the answer, it is not that simple, but answers has to be simple. We need new technologies and the right one to use should change, that is called progress and development.
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What type of doping have the drain and the source of a PMOS transistor?
PMOS - (drain + source) = p-type doping NMOS - (drain + source) = n-type doping :)
What are sleep transistors?
A rest transistor is either a pMOS or nMOS high VT transistor and is utilized as a change to close off force supplies to parts of a configuration in standby mode. The pMOS rest transistor is utilized to switch VDD supply and henceforth is known as a "header switch."
Why is the substrate in nmos connected to ground and in pmos to vdd?
we try to reverse bias not the channel and substrate but we try to maintain the source,drain junctions reversed biased with respect to the substrate so that we dont loose our current in the substrate.
What is a NMOS PLA?
NMOS PLA is a Programmable Logic Array which is designed by employing NMOS technology i.e. by employing nmos transistors to realize the required gates of PLA. PLA is a combination AND gates and OR gates to produced sum of products terms needed for realizing the required combinational logic. It consists of an array of AND gates followed by OR plane. the connections to the AND and OR inputs can be programmed based on our needs.
Why CMOS connected to VDD and NMOS to Vcc?
Error on schematic. All MOS is powered by Vdd and/or Vss (drain/source). Only bipolar is powered by Vcc and/or Vee (collector/emitter).
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.
Is cmos a combination of both nmos and pmos?
yes
What are advantages of transmission gate logic over Cmos logic?
cmos logic circuit uses particularly pmos or nmos viz. passes strong 1 and strong zero respectively and also degraded zero's and one's in their respective cases of p and nmos so to remove deggraded output the nmos and pmos are combined together for strong output level
What happens if you interchange pmos and nmos in a cmos inverter?
it becomes a buffer
What is the use of pseudo nMOS gates in digital design?
These circuits use nMOS for implementation of a whole gate + one pMOS which is connected between positive supply and nMOS.
What are the Disadvantages of cmos over pmos and nmos?
CMOS and NMOS are two logic families. As the name itself indicates, CMOS is complementary Metal Oxide Semiconductor technology. It uses both PMOS and NMOS transistors for design. Whereas, NMOS logic family uses only NMOS FETs for design.
What happens if you change pmos to nmos and nmos to pmos in cmos?
It will act like a buffer but not the exact buffer. Since nmos conduct logic 1 weakly and pmos conduct logic 0 weakly, the output ranges from vdd-vtn to vtp. For eg. If you apply 5v then the op will be 4.3 not the complete 5v. If you apply 0v then output will be 0.7v not 0 v. Hope this works
What type of doping have the drain and the source of a PMOS transistor?
PMOS - (drain + source) = p-type doping NMOS - (drain + source) = n-type doping :)
Which mos needs logic '1' on its gate terminal to get ON?
It is NMOS FET. PMOS works in a reverse way.
What is difference between inverter and buffer?
if you connect Nmos and Pmos other way around then it act as buffer
Why the resistance of PMOS is greater than NMOS?
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.
