subcircuit's Introduction

SubCircuit

A Python Based Circuit Simulator

Requires Python 2.7, Scipy Stack and wxPython.

Note: Many devices are not yet implemented. This is currently at a proof-of-concept phase. The devices and circuits shown in these examples are all currently supported and working.

I'm looking for someone with Python and EE experience to help develop the rest of the atomic SPICE elements.

##Graphical and Programmatic Netlist Creation and Simulation

PySpyce allows the creation of netlists through a schematic editor or directly with a Python script.

Graphical Example

On a Mac:

On Windows:

Plotting:

Programmatic Netlist Development

netlist = Netlist("Distributed Tline")

# define section subckt:
section = netlist.subckt('section', Subckt((1, 2)))
section.device('L', L((1, 2), 0.001))
section.device('C', C((2, 0), 0.0001))

# source:
netlist.device('V1', V((1, 0), Sin(0.0, 100.0, 60.0)))

# add 6 sections:
for i in range(1, 8):
    name = "X{0}".format(i)
    netlist.device(name, X((i, i+1), subckt='section'))

# load:
netlist.device('R1', R((8, 0), 5.0))

# transient simulation:
netlist.trans(0.0001, 0.1)

# plot all voltages:
voltages = []
for i in range(1, 9):
    voltages.append(Voltage(i))

netlist.plot(*voltages)

Or Build Netlists Just As You Would in SPICE

# SPICE Netlist:

""" 
Example Transformer
VIN 1 0 SIN(0 170 60 0 0)
L1 1 0 2000
L2 2 0 200
K1 L1 L2 0.99999
RL 2 0 500
.TRAN 0.2M 25M
.PLOT TRAN V(1)
.PLOT TRAN V(2)
.END
"""

# Equivalent Subcircuit Netlist:

netlist = Netlist("Example Transformer")
netlist.device("V1N", V((1, 0), Sin(0, 170, 60, 0, 0)))
netlist.device("L1", L((1, 0), 2000))
netlist.device("L2", L((2, 0), 200))
netlist.device("K1", K('L1', 'L2', 0.99999))
netlist.device("RL", R((2, 0), 500.0))
netlist.trans(0.00002, 0.025)
netlist.plot(Voltage(1), Voltage(2))

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