Question

2. Design a 1 bit full adder (inputs:A,B,CARRY_IN - outputs:SUM,CARRY_OUT) using: (a) basic CMOS gates: inverter, NOR and NAND gates (b) complex CMOS logic gates and inverters (c) compare the difference in transistor counts (d) assuming all transistors are the same size and kn'= kp', which version of the function do you expect to be faster? Why?

Answer 1

using cmos logici first create inverted upn ven von for a, b, Cin 31 ziuni cin a b lin. Con I love 1 1 r Collel Ed[dh do cin 4401 Sun lo T ༽༠ ༠༣ - I TE T

. carry?- Abe blin Alin A VPD VID VOD carry This circuit gives ..carty Cay 19

complex cmos logic :- is same for both only differs carry sum cases. sum 2 a 60 cin VDO V ron. . A B W cin I ath Ā GG - CinĆ brain. - - In there cmos gate, basic 24 transistors are > in complexe 20 transistors are there, complex cmos gate logic faster, because number of transistors are increasing will decrease and there will be delay in circuit so complex cmos gate logic is faster than basic cmos gate Logic..

|-bit full adder Truth table A B ein Sam öo 0 - oo - -.0 - a - Oo Oo. 0 1 0 0 1 1 jo Doi0 1 1.o īTii 0 O Sum;-. a b bin Carry :- ab + Cin b+ Cina, sum can be written in the form of i ab cint á búin tabcin + abcin.