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categoryالهندسة الكهربائية
schoolبكالوريوس
event_available2026-07-15
السؤال
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Given the input probabilities, PA = PB = Pc = PD = 0.5. Inputs are uncorrelated. Please:
1) Find out the activity factor at the output of Fig. 5.
2) Estimate the dynamic power consumption. Given switching capacitance of 450 pF, and runs at 450
MHz at VDD=0.9 V.
3) Sketch a stick diagram of 2-input NAND gate, minimizing the contacts at the output.
4) Estimate the area of 2-input NAND gate from the stick diagram by using \ rules.
A
B
D
0
U
D
Fig. 5: 4-Input NAND.
I. FORMULA SHEET
1) NMOS: B = C(W/L), triode Ip = Bu((Vos-Vin)Vos-(VBs/2)); saturation fp = 1/2ẞ(VGS-
V), subthreshold ID = IDoc((Ves Val(V) (1-e-Vus/V); Vth = V + (√√√SB+s - √s)
2) PMOS: BC (W/L), triode fp =B((VsG-Vin)VSD-(V/2)); saturation Ip = 1/28, (Vsc-
|Ven)²;
3) Demorgan's Law: A
4) Noise margin: NM,
B
=
=
VIL
A+ B; A+B A B
VOL: NM VON - VIH
5) Delay model: d=gh+p; h = C
-
6) Path delay: D = NF¹N + P; F = GHB; B is the branch effort; H is the path electrical effort; G
is path logic effort; N = log
7) FO4 delay: 5 T
8) Elmore Delay: p≈ΣRi-to-source Ci
9) Power: Pdixx = αCVBD!
10) Activity factor: a = P-P
11) A metal wire track pitch is 8
12) Relative permittivity of SiO2: Cox = 3.9
13) Permittivity of free space: 8.854 10 12 F/m
14) Setup time: tschap Spey + d + skew
15) Hold time: hold Steeq +ted - takew
L
16) R = Requare w
17) Cox
-
for
18) Pfailure = Ne-(Te-t-setup)/73
19) Output probabilities of various factor gates as a function of their input probabilities. Given inputs
are uncorrelated.
Gale
AND2
Py
PA-PB
AND3
PA PB PC
OR2
1-PA-PB
NAND2
NOR2
XOK2
1-PA-PR
PA PB
PA PB+PA PB
20) Logical effort of static common gates
Gate Type
Number of Inputs
1 2
3
4
п
INV
NAND
NOR
1
4/3
513 6/3 (n+2)/3
5/3
753 9/3 (2n+1)/3
21) Parasitic delay of static common gates
Number of Inputs
Gate Type
1
2 3 4
INV
1
NAND
NOR
2 3
4
2 3 4
נו
נו
The common used Verilog HDL operators are listed in Table. III.
TABLE III: Verilog Common Operators
Operator
Name
Functional Group
U
bit select
0
parenthesis
&
reduction AND
reduction
reduction OR
reduction
-&
reduction NAND
reduction
-|
reduction NOR
reduction
reduction XOR
reduction
-or-
reduction XNOR
reduction
[ ]
concatenation
concatenation
1
%
« and »
> and <
2
[{ }]
multiply
divide
modulus
replication
replication
arithmetic
arithmetic
arithmetic
shift left/right
shift
greater less than
relational
>= and <=
greater/less or equal
relational
===
case equality
equality
case inequality
equality
&
bit-wise AND
hit-wise
bit-wise XOR
bit-wise
I
bit-wise OR
bit-wise
negation
bit-wise
&&
logical AND
logical
logical OR
logical
i
logic negation
logical
2:
conditional
conditional
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