Modules

Lcapy is a Python library for symbolic linear circuit and signal analysis.

Lcapy can analyse circuits described with netlists using modified nodal analysis. See lcapy.netlist

Alternatively, Lcapy can analyse networks and circuits formed by combining one, two, and three port networks. See lcapy.oneport

For detailed documentation see http://lcapy.readthedocs.io/en/latest

Copyright 2014–2022 Michael Hayes, UCECE

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Circuit analysis

lcapy.circuit	This module provides circuit analysis using modified nodal analysis (MNA).
lcapy.netlist	This module provides the Netlist class.
lcapy.netfile	This module provides the NetfileMixin class.
lcapy.mna	This module implements modified nodal analysis (MNA).
lcapy.statespace	This module defines the StateSpace class for representing a linear continuous time-invariant system as a state-space model.
lcapy.loopanalysis	This module performs loop analysis.
lcapy.nodalanalysis	This module performs nodal analysis.
lcapy.oneport	This module supports simple linear one-port networks based on the following ideal components:
lcapy.expr(arg[, var, override, units])	Create Lcapy expression from arg.
lcapy.sexpr(arg, **assumptions)	Create LaplaceDomainExpression object.
lcapy.cexpr(arg[, frequency])	Create Lcapy ConstantDomainExpression object.
lcapy.texpr(arg, **assumptions)	Create TimeDomainExpression object.
lcapy.fexpr(arg, **assumptions)	Create FourierDomainExpression object.
lcapy.nexpr(arg, **assumptions)	Create DiscreteTimeDomainExpression object.
lcapy.kexpr(arg, **assumptions)	Create DiscreteFourierDomainExpression object.
lcapy.zexpr(arg, **assumptions)	Create ZDomainExpression object.
lcapy.sequence	This module handles sequences.
lcapy.omegaexpr(arg, **assumptions)	Create AngularFourierDomainExpression object.
lcapy.noiseexpr	This module provides the NoiseExpression class to represent noise expressions.
lcapy.phasor(arg[, omega])	Create phasor.
lcapy.matrix(mat)	Create Lcapy Matrix from a SymPy Matrix.
lcapy.smatrix	This module implements the LaplaceDomainMatrix class for a matrix of Laplace-domain expressions.
lcapy.tmatrix	This module implements the TimeDomainMatrix class for a matrix of time-domain expressions.
lcapy.network	This module provides the Network sub class for OnePort and TwoPort classes.
lcapy.voltage(arg, **assumptions)	Create a voltage object from the specified arg.
lcapy.current(arg, **assumptions)	Create a current object from the specified arg.
lcapy.superposition	This module provides the SuperpositionDomainExpression class.
lcapy.admittance(arg[, causal])	Create an admittance object from the specified arg.
lcapy.impedance(arg[, causal])	Create an impedance object from the specified arg.
lcapy.functions	This module wraps SymPy functions and provides a few others.
lcapy.symbols(names, **assumptions)	Create Lcapy symbols from whitespace or comma delimited string of symbol names.
lcapy.mnacpts	This module defines the components for modified nodal analysis.
lcapy.laplace	This module provides support for Laplace transforms.
lcapy.fourier	This module provides support for Fourier transforms.
lcapy.ztransform	This module provides support for z transforms.
lcapy.transform	This module performs transformations between domains.
lcapy.plot	This module performs plotting using matplotlib.
lcapy.acdc	This module provides the CausalChecker, ACChecker, and DCChecker classes as used by the is_causal, is_ac, and is_dc functions.
lcapy.ratfun	This module provides support for rational functions.

Schematics

lcapy.schematic	This module performs schematic drawing using circuitikz from a netlist.
lcapy.schemcpts	This module defines and draws the schematic components using circuitikz.
lcapy.schemgraph	This module provides classes for schematic layout.
lcapy.schemmisc	This module provides miscellaneous support for schematic drawing.

General

lcapy.config	This module contains configuration information.
lcapy.grammar	This module defines a grammar for SPICE-like netlists.
lcapy.parser	This module performs parsing of SPICE-like netlists.
lcapy.printing	This module provides printing support.
lcapy.latex
lcapy.context	This module provides the Context class that maintains the context for a Circuit.
lcapy.state	This maintains Lcapy's state, such as the defined symbols, and behaviour.
lcapy.system	This module wraps system dependent programs for pdf generation, etc.
lcapy.units	This module provides the Units class for simplification of units.
lcapy.utils	This module provides common utility functions.