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Compare four different 4-bit full adders,
made of NAND gates
Simulating for 6400ns
adder_bib
The old spice bipolar NAND gate full adder
Simulation time 14.0s
adder_mos
A MOS NAND gate inverter, using BSIM3 and OpenMP
Simulation time 10.5s
adder_behav
NAND gates made with XSPICE digital devices,
but each has an analog interface, the interconnect
is analog, gate library is 74HCng_short_2.lib
Simulation time 1.9s
adder_Xspice
Fully digital, event node based NAND gates
digital plotting into vcd file, display with gtkwave
Simulation time 0.27s
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