Circuit elements¶

class pycircuit.circuit.elements.R(*args, **kvargs)¶

Resistor element

>>> c = SubCircuit()
>>> n1=c.add_node('1')
>>> c['R'] = R(n1, gnd, r=1e3)
>>> c['R']
R('plus','minus',r=1000.0,noisy=True)
>>> c.G(numeric.zeros(2))
array([[ 0.001, -0.001],
       [-0.001,  0.001]])
>>> c = SubCircuit()
>>> n2=c.add_node('2')
>>> c['R'] = R(n1, n2, r=1e3)
>>> c.G(numeric.zeros(2))
array([[ 0.001, -0.001],
       [-0.001,  0.001]])

class pycircuit.circuit.elements.C(*args, **kvargs)¶

Capacitor

>>> c = SubCircuit()
>>> n1=c.add_node('1')
>>> c['C'] = C(n1, gnd, c=1e-12)
>>> c.G(numeric.zeros(2))
array([[ 0.,  0.],
       [ 0.,  0.]])
>>> c.C(numeric.zeros(2))
array([[  1.00000000e-12,  -1.00000000e-12],
       [ -1.00000000e-12,   1.00000000e-12]])

class pycircuit.circuit.elements.L(*args, **kvargs)¶

Inductor

>>> c = SubCircuit()
>>> n1=c.add_node('1')
>>> c['L'] = L(n1, gnd, L=1e-9)
>>> c.G(numeric.zeros(3))
array([[ 0.,  0.,  1.],
       [ 0.,  0., -1.],
       [ 1., -1.,  0.]])
>>> c.C(numeric.zeros(3))
array([[  0.0000e+00,   0.0000e+00,   0.0000e+00],
       [  0.0000e+00,   0.0000e+00,   0.0000e+00],
       [  0.0000e+00,   0.0000e+00,  -1.0000e-09]])

class pycircuit.circuit.elements.VS(*args, **kvargs)¶

Independent DC voltage source

>>> from dcanalysis import DC
>>> c = SubCircuit()
>>> n1=c.add_node('1')
>>> c['vs'] = VS(n1, gnd, v=1.5)
>>> c['R'] = R(n1, gnd, r=1e3)
>>> DC(c,refnode=gnd).solve().x
array([ 1.5   ,  0.    , -0.0015])

class pycircuit.circuit.elements.VSin(*args, **kvargs)¶: Independent sinus volatge source

class pycircuit.circuit.elements.ISin(*args, **kvargs)¶: Independent sinus current source

class pycircuit.circuit.elements.VPulse(*args, **kvargs)¶: Independent pulse voltage source

class pycircuit.circuit.elements.VCVS(*args, **kvargs)¶

Voltage controlled voltage source

>>> from dcanalysis import DC
>>> c = SubCircuit()
>>> n1, n2 =c.add_nodes('1', '2')
>>> c['vs'] = VS(n1, gnd, v=1.5)
>>> c['vcvs'] = VCVS(n1, gnd, n2, gnd, g=2)
>>> c.nodes
[Node('1'), Node('2'), Node('gnd', isglobal=True)]
>>> c.branches
[Branch(Node('1'),Node('gnd', isglobal=True)), Branch(Node('2'),Node('gnd', isglobal=True))]
>>> c['vcvs'].G(numeric.zeros(4))
array([[ 0.,  0.,  0.,  0.,  0.],
       [ 0.,  0.,  0.,  0.,  0.],
       [ 0.,  0.,  0.,  0.,  1.],
       [ 0.,  0.,  0.,  0., -1.],
       [ 2., -2., -1.,  1.,  0.]])

class pycircuit.circuit.elements.SVCVS(*args, **kvargs)¶

Voltage controlled voltage source with frequency dependent transfer

>>> from dcanalysis import DC
>>> c = SubCircuit()
>>> n1, n2 =c.add_nodes('1', '2')
>>> c['vs'] = VS(n1, gnd, v=1.5)
>>> c['vcvs'] = VCVS(n1, gnd, n2, gnd, g=2)
>>> c.nodes
[Node('1'), Node('2'), Node('gnd', isglobal=True)]
>>> c.branches
[Branch(Node('1'),Node('gnd', isglobal=True)), Branch(Node('2'),Node('gnd', isglobal=True))]
>>> c['vcvs'].G(numeric.zeros(4))
array([[ 0.,  0.,  0.,  0.,  0.],
       [ 0.,  0.,  0.,  0.,  0.],
       [ 0.,  0.,  0.,  0.,  1.],
       [ 0.,  0.,  0.,  0., -1.],
       [ 2., -2., -1.,  1.,  0.]])

class pycircuit.circuit.elements.VCCS(*args, **kvargs)¶

Voltage controlled current source

>>> from dcanalysis import DC
>>> c = SubCircuit()
>>> n1,n2 = c.add_nodes('1', '2')
>>> c['vs'] = VS(n1, gnd, v=1.5)
>>> c['vccs'] = VCCS(n1, gnd, n2, gnd, gm=1e-3)
>>> c['rl'] = R(n2, gnd, r=1e3)
>>> DC(c,refnode=gnd).solve().x
array([ 1.5, -1.5,  0. ,  0. ])

class pycircuit.circuit.elements.Nullor¶

From Wikipedia, the free encyclopedia

A nullor is a theoretical two-port network comprised of a nullator at its input and a norator at its output.[1] Nullors represent an ideal amplifier, having infinite current, voltage, transconductance and transimpedance gain.[2] Its transmission parameters are all zero.

[1] The name “nullor” was introduced by H.J. Carlin
Singular network elements, IEEE Trans. Circuit Theory, March 1965, vol. CT-11, pp. 67-72.

[2] Verhoeven C J M van Staveren A Monna G L E Kouwenhoven
M H L & Yildiz E (2003). Structured electronic design: negative feedback amplifiers. Boston/Dordrecht/London: Kluwer Academic, ï¿½2.2.2 pp. 32-34. ISBN 1402075901.

class pycircuit.circuit.elements.Gyrator¶

>>> c = SubCircuit()
>>> n1=c.add_node('1')
>>> n2=c.add_node('2')
>>> n3=c.add_node('3')
>>> n4=c.add_node('4')
>>> c['Gyrator'] = Gyrator(n1, n2, n3, n4, gm=1)
>>> c['Gyrator'].G(numeric.zeros(4))
array([[ 0.,  0.,  1., -1.],
       [ 0.,  0., -1.,  1.],
       [-1.,  1.,  0.,  0.],
       [ 1., -1.,  0.,  0.]])

class pycircuit.circuit.elements.Diode(*args, **kvargs)¶: Nonlinear diode

class pycircuit.circuit.elements.VCVS_limited(*args, **kvargs)¶

Voltage controlled voltage source with limited output voltage.

The output voltage is limited by a $Than$ function

class pycircuit.circuit.elements.Idtmod(*args, **kvargs)¶

Modulus integrator

Output voltage is the time integral of input voltage, modulo “modulus”, and an offset.

>>> import pycircuit.circuit._numeric as numeric
>>> from pycircuit.circuit.transient import Transient
>>> c = SubCircuit()
>>> nin, nout = c.add_nodes('in', 'out')
>>> c['vin'] = VS(nin, gnd, v=1.0)
>>> c['R'] = R(nout, gnd, r=1e3)
>>> c['Idtmod'] = Idtmod(nin, gnd, nout, gnd, modulus=1.0)
>>> tran = Transient(c, toolkit=numeric)
>>> result = tran.solve(tend=1.5, timestep=0.5)
>>> result.v(nout).y
array([ 0.5,  0. ,  0.5])

Circuit elements¶

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