STICK DIAGRAMS 1
1
STICK DIAGRAMS
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STICK DIAGRAM:
green,, yellow n-diffusion, p-difffusion
Red Polysilicon
Blue Metal
Yellow Implant
Black Contact areas
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NMOS ENHANCEMENT TRANSISTOR:
When polysilicon crosses n-diffusion a transistor forms
n-diffusion
polysilicon
4
NMOS DEPLETION TRANSISTOR:
diffusion
polysilicon
implant
5
PMOS ENHANCEMENT TRANSISTOR:
When polysilicon crosses p-diffusion a transistor forms
P-diffusion
polysilicon
5
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STICK DIAGRAM FOR NMOS INVERTER:
vin
gnd
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STEP1:
Draw metal(blue) VDD and GND rails in parallel with enough separation
VDD
GND
8
vin
gnd
STEP2:
Forming transistorsVDD
GND
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STEP2-1:
vin
gnd Vin
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STEP3:
interconnections
vin
gnd
Vout
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STEP4:
Contact points
vin
gnd
VDD
GND
Vout
Vin
12
A nand B
Vdd
Vss
A
B
13
Vdd
Vss
A
Ploy(G)
Ploy(G)
s
s
D
D
B
Ploy(G)
Vout(A nand B)
Nmos NAND GATE
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A nor B
A B
Vdd
Vss
Nmos NOR GATE
1515
Vdd
Vss
A
Ploy(G)
Ploy(G)
s s
DD
B
Vout(A nor B)
Nmos NOR GATE
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CMOS STICK ENCODINGS
layer color stick notation color code
n-diffusion Green
p-diffusion yellow
polysilicon red
metal-1 blue
metal-2 dark blue or purple
contact cut black
via black
demarcationline -------------------------------------------------------' brown
Vdd orVss contact black
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CMOS INVERTER:
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STEP1:
Draw VDD & GND rails
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STEP2:
Forming transistors
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STEP3: How to identify whether the transistor
is nmos or pmos???????????????? Using demarcation line(----------------)
pmos
nmos
Demorcation line
Vdd
Vss
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STEP4: Inter connections
pmos
nmos
Demorcaion line
input output
STEP5: Contact points
pmos
nmos
Demorcaion line
inputoutput
VDD
GND 22
23
A A nand BB
Vdd
Vss
Cmos NAND GATE
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Demarcation Line
Vdd contact
Vss contact
Vdd
Vss
Vout(A nor B)
A
Ploy(G)
Ploy(G)
Ploy(G)
Ploy(G)
B
s s
s
s
D
D D
D
Cmos NAND GATE
25
A nor BA
B
Vdd
Vss
Cmos Nor GATE
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Vdd contact
Vss contact
Vdd
Vss
Demarcation Line
Vout(A nand B)
A
Ploy(G)
Ploy(G)
Ploy(G)
Ploy(G)
s
s
s s
D
D
D
D
B
Cmos Nor GATE
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Vdd
Vss
Vin
Vout
BiCmos inverter
Vss contact
Vdd
Vss
Demarcation Line
Vout
Vdd contact
BiCmos inverter
29
Vdd
Vss
Vin
Vout
BiCmos inverter
30Vss contact
Vdd
Vss
Demarcation Line Vou
t
Vdd contact
BiCmos inverter