Which gate is normally preferred while implementing circuits
using CMOS logic, NAND or NOR? Why?
Answers were Sorted based on User's Feedback
Answer / pavan kumar gunda
NAND IS PREFERD BECOZ OF ITS HIGH DRIVING CAPACITY....
Is This Answer Correct ? | 6 Yes | 6 No |
Answer / velpula prakash
1. Actually in cmos nand pmos devices are in llel and nmos are in series where as in nor reverse,and mobility of electrons is almost three times faster than the holes.so in nor holes has to cross the two channel lengths so they can drive the output little bit late where as in nand electrons has to pass through only one channnel length,so they drive the output to high early.
2. High to Low and low to high times for nand is almost same where as for nor low to high time is greater than the high to low.
3. actually in nor gates because holes drives the output to high in some what high time so to reduce that time manufacturers use to make the pmos in larger size than nmos(only in cmos nor gate),so if we make that pmos larger size it can produce larger number of holes and it can drive the output to high in lesser time .
4. Due to third point nor gates uses some what greater silicon area as compared to nand gates , so the nor gates are somewhat higher cost than that of nor gates.
5. So industry people usually buys so many gates , if they buy nand gates the investment reduces.
Thanks and regards
velpula prakash
if there are any wrongs in my post pls respond to them
Is This Answer Correct ? | 0 Yes | 0 No |
Basic Stuff related to Perl?
What is the mealy and moore machine's state diagram that can detect 3 consecutive heads of 3 coins ?
What is Noise Margin? Explain the procedure to determine Noise Margin?
What are the different design constraints occur in the synthesis phase?
What work have you done on full chip Clock and Power distribution? What process technology and budgets were used?
Describe a finite state machine that will detect three consecutive coin tosses (of one coin) that results in heads.
In vlsi chip 1000s of transistors are dropped, specifically categorized. Which method is used to achieve this & how it is done practically?
what is Channel length modulation?
Draw a transistor level two input NAND gate. Explain its sizing (a) considering Vth (b) for equal rise and fall times
What is the main function of metastability in vsdl?
How binary number can give a signal or convert into a digital signal?
what is the doping?