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ADDER - 4 BIT ALL-NAND-GATE BINARY ADDER
*** SUBCIRCUIT DEFINITIONS
.SUBCKT NAND in1 in2 out
* NODES: INPUT(2), OUTPUT
a6 [in1 in2] out nand1
.ENDS NAND
.model nand1 d_nand(rise_delay = 0.7e-9 fall_delay = 0.7e-9
+ input_load = 0.5e-12)
.SUBCKT ONEBIT 1 2 3 4 5
* NODES: INPUT(2), CARRY-IN, OUTPUT, CARRY-OUT
X1 1 2 7 NAND
X2 1 7 8 NAND
X3 2 7 9 NAND
X4 8 9 10 NAND
X5 3 10 11 NAND
X6 3 11 12 NAND
X7 10 11 13 NAND
X8 12 13 4 NAND
X9 11 7 5 NAND
.ENDS ONEBIT
.SUBCKT TWOBIT 1 2 3 4 5 6 7 8
* NODES: INPUT - BIT0(2) / BIT1(2), OUTPUT - BIT0 / BIT1,
* CARRY-IN, CARRY-OUT
X1 1 2 7 5 10 ONEBIT
X2 3 4 10 6 8 ONEBIT
.ENDS TWOBIT
.SUBCKT FOURBIT 1 2 3 4 5 6 7 8 9 10 11 12 13 14
* NODES: INPUT - BIT0(2) / BIT1(2) / BIT2(2) / BIT3(2),
* OUTPUT - BIT0 / BIT1 / BIT2 / BIT3, CARRY-IN, CARRY-OUT
X1 1 2 3 4 9 10 13 16 TWOBIT
X2 5 6 7 8 11 12 16 14 TWOBIT
.ENDS FOURBIT
*** ALL INPUTS (analog)
VIN1A a1 0 DC 0 PULSE(0 3 0 0.5NS 0.5NS 20NS 50NS)
VIN1B a2 0 DC 0 PULSE(0 3 0 0.5NS 0.5NS 30NS 100NS)
VIN2A a3 0 DC 0 PULSE(0 3 0 0.5NS 0.5NS 50NS 200NS)
VIN2B a4 0 DC 0 PULSE(0 3 0 0.5NS 0.5NS 90NS 400NS)
VIN3A a5 0 DC 0 PULSE(0 3 0 0.5NS 0.5NS 170NS 800NS)
VIN3B a6 0 DC 0 PULSE(0 3 0 0.5NS 0.5NS 330NS 1600NS)
VIN4A a7 0 DC 0 PULSE(0 3 0 0.5NS 0.5NS 650NS 3200NS)
VIN4B a8 0 DC 0 PULSE(0 3 0 0.5NS 0.5NS 1290NS 6400NS)
*** analog to digital
abridge2 [a1 a2 a3 a4 a5 a6 a7 a8] [1 2 3 4 5 6 7 8] adc_buff
.model adc_buff adc_bridge(in_low = 1 in_high = 2)
*** digital 0
V0 a0 0 0
abridge0 [a0] [d0] adc_buff
*** DEFINE NOMINAL CIRCUIT
X1 1 2 3 4 5 6 7 8 s0 s1 s2 s3 d0 c3 FOURBIT
*.TRAN 500p 6400NS
* save inputs
*.save V(a1) V(a2) V(a3) V(a4) V(a5) V(a6) V(a7) V(a8)
*.save v(1)
.control
*save v(1)
TRAN 500p 6400NS
rusage
display
edisplay
* save data to input directory
cd $inputdir
eprvcd 1 2 3 4 5 6 7 8 s0 s1 s2 s3 c3 > adder_x.vcd
* plotting the vcd file (e.g. with GTKWave)
* For Windows: returns control to ngspice
shell start gtkwave adder_x.vcd --script nggtk.tcl
* Others
*shell gtkwave adder_x.vcd --script nggtk.tcl &
.endc
.END
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