stick diagrams
TRANSCRIPT
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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
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NMOS DEPLETION TRANSISTOR:
diffusion
polysilicon
implant
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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
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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
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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
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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
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Vdd
Vss
Vin
Vout
BiCmos inverter
30Vss contact
Vdd
Vss
Demarcation Line Vou
t
Vdd contact
BiCmos inverter