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ADDER - 4 BIT ALL-NAND-GATE BINARY ADDER
*** SUBCIRCUIT DEFINITIONS
.SUBCKT NAND in1 in2 out VDD
* NODES: INPUT(2), OUTPUT, VCC
M1 out in2 Vdd Vdd p1 W=7.5u L=0.35u pd=13.5u ad=22.5p ps=13.5u as=22.5p
M2 net.1 in2 0 0 n1 W=3u L=0.35u pd=9u ad=9p ps=9u as=9p
M3 out in1 Vdd Vdd p1 W=7.5u L=0.35u pd=13.5u ad=22.5p ps=13.5u as=22.5p
M4 out in1 net.1 0 n1 W=3u L=0.35u pd=9u ad=9p ps=9u as=9p
.ENDS NAND
.SUBCKT ONEBIT 1 2 3 4 5 6
* NODES: INPUT(2), CARRY-IN, OUTPUT, CARRY-OUT, VCC
X1 1 2 7 6 NAND
X2 1 7 8 6 NAND
X3 2 7 9 6 NAND
X4 8 9 10 6 NAND
X5 3 10 11 6 NAND
X6 3 11 12 6 NAND
X7 10 11 13 6 NAND
X8 12 13 4 6 NAND
X9 11 7 5 6 NAND
.ENDS ONEBIT
.SUBCKT TWOBIT 1 2 3 4 5 6 7 8 9
* NODES: INPUT - BIT0(2) / BIT1(2), OUTPUT - BIT0 / BIT1,
* CARRY-IN, CARRY-OUT, VCC
X1 1 2 7 5 10 9 ONEBIT
X2 3 4 10 6 8 9 ONEBIT
.ENDS TWOBIT
.SUBCKT FOURBIT 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
* NODES: INPUT - BIT0(2) / BIT1(2) / BIT2(2) / BIT3(2),
* OUTPUT - BIT0 / BIT1 / BIT2 / BIT3, CARRY-IN, CARRY-OUT, VCC
X1 1 2 3 4 9 10 13 16 15 TWOBIT
X2 5 6 7 8 11 12 16 14 15 TWOBIT
.ENDS FOURBIT
*** POWER
VCC 99 0 DC 3.3V
*** ALL INPUTS
VIN1A 1 0 DC 0 PULSE(0 3 0 5NS 5NS 20NS 50NS)
VIN1B 2 0 DC 0 PULSE(0 3 0 5NS 5NS 30NS 100NS)
VIN2A 3 0 DC 0 PULSE(0 3 0 5NS 5NS 50NS 200NS)
VIN2B 4 0 DC 0 PULSE(0 3 0 5NS 5NS 90NS 400NS)
VIN3A 5 0 DC 0 PULSE(0 3 0 5NS 5NS 170NS 800NS)
VIN3B 6 0 DC 0 PULSE(0 3 0 5NS 5NS 330NS 1600NS)
VIN4A 7 0 DC 0 PULSE(0 3 0 5NS 5NS 650NS 3200NS)
VIN4B 8 0 DC 0 PULSE(0 3 0 5NS 5NS 1290NS 6400NS)
*** DEFINE NOMINAL CIRCUIT
X1 1 2 3 4 5 6 7 8 9 10 11 12 0 13 99 FOURBIT
.option noinit acct
.TRAN 500p 6400NS
* save inputs
.save V(1) V(2) V(3) V(4) V(5) V(6) V(7) V(8)
* use BSIM3 model with default parameters
.model n1 nmos level=49 version=3.3.0
.model p1 pmos level=49 version=3.3.0
*.include ./Modelcards/modelcard32.nmos
*.include ./Modelcards/modelcard32.pmos
.control
pre_set strict_errorhandling
unset ngdebug
*save outputs and specials
save x1.x1.x1.7 V(9) V(10) V(11) V(12) V(13)
run
display
* plot the inputs, use offset to plot on top of each other
plot v(1) v(2)+4 v(3)+8 v(4)+12 v(5)+16 v(6)+20 v(7)+24 v(8)+28
* plot the outputs, use offset to plot on top of each other
plot v(9) v(10)+4 v(11)+8 v(12)+12 v(13)+16
.endc
.END
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