pySpice package

Subpackages

• pySpice.parser package
  • pySpice.parser.parser module
  • pySpice.parser.parseline module
  • pySpice.parser.internalize module
  • pySpice.parser.utils module
• pySpice.solver package
  • pySpice.solver.solver module
  • pySpice.solver.stamp module
  • pySpice.solver.engine module
• pySpice.exhibitor package
  • pySpice.exhibitor.formator module
  • pySpice.exhibitor.plotter module

Submodules

pySpice.element_class module

These classes works more like C Structure. It stores the information of the circuit element or SPICE commands into its different fields.

class pySpice.element_class.analysis_ac(generator)

class pySpice.element_class.analysis_dc(swp_src, generator)

Member:

• swp_src: the value of the sweep points are put into a generator

class pySpice.element_class.analysis_tran(generator, step)

class pySpice.element_class.capacitor(*av)

Bases: pySpice.element_class.ele_2port

class pySpice.element_class.cccs(loc_ctrl_brch, *av)

Bases: pySpice.element_class.ele_2port

class pySpice.element_class.ccvs(brch_num, loc_ctrl_brch, *av)

Bases: pySpice.element_class.ele_2port

class pySpice.element_class.diode(model, *av)

Bases: pySpice.element_class.ele_2port

class pySpice.element_class.ele_2port(catagory, name, loc_p, loc_n, value)

Base class for most dual-port circuit elements

Member:

• catagory: describing what kind of device this instance belong to
• loc_p: Positive port in internal representation(an integer)
• branch_flag: whether this element need a variable to represent the current throught it.

class pySpice.element_class.exp_src

class pySpice.element_class.i_src(*av)

Bases: pySpice.element_class.ele_2port

class pySpice.element_class.inductor(branch_num, *av)

Bases: pySpice.element_class.ele_2port

Member:

• branch: the internal variable represent the current throught it

class pySpice.element_class.mos(name, model, loc_d, loc_g, loc_s, loc_b)

class pySpice.element_class.print_item(cmd)

The PRINT/PLOT commands are parsed to the instance of this class

Member:

• cmd: the original string describing the plot/print
• ac_flag: whether it’s an AC plot, because the print/plot command to AC need special process(they have another character noting to plot magnitude, phase or anything else
• op_flag: some plot need to calculate the difference between two nodes. If so, this flag is setted.
• op_list: document which two nodes need to do opeeration on

class pySpice.element_class.pulse_src(vgnd, vdd, td, tr, tf, pw, per)

The meaning of these fields refer to this graph:

class pySpice.element_class.resistor(*av)

Bases: pySpice.element_class.ele_2port

class pySpice.element_class.sin_src(vdd, vgnd, freq)

class pySpice.element_class.stair_src(vgnd, vdd, up_moment)

class pySpice.element_class.sweep_item(switch, coord)

The standard information package the stamp function pass to the engine module. Control the behavior of the engine

Member:

• switch: a string either of ‘gen’ or ‘upd’. If ‘gen’ it tells the engine in each iteration the new stamp value come from a generator. Otherwise, the value get its update from the solution of previous iteration
• coord: where the new stamp fit in
• generator: the generator to offer the new value
• updata_src: the coordinate where to retrieve the updata value

class pySpice.element_class.v_src(brch_num, *av)

Bases: pySpice.element_class.ele_2port

class pySpice.element_class.vccs(loc_ctrl_p, loc_ctrl_n, *av)

Bases: pySpice.element_class.ele_2port

class pySpice.element_class.vcvs(loc_ctrl_p, loc_ctrl_n, brch_num, *av)

Bases: pySpice.element_class.ele_2port

pySpice.global_data module

Global Data Structure

This Structure will be used all over the program, so I set them as global data structure. The part above the pound key dividing line is the structure container of the internal representation of the circuit. Below the dividing line is some parameter regarding the MOSFET, DIODE parameters

MNA_dim:the dimension of the MNA matrix ELEMENT_DICT:a python dictionary containing the instances of the circuit elements, with their name as index SETTING_LIST:list containing the setting commands of SPICE ANALYSIS_LIST:list comtaining the analysis commands, which are parsed into special designed class instance PRINT_DICT:PRINT/PLOT commands in SPICE are parsed specially as the instance of the print_item class. These instances are put into respective list of this dictionary. watch_list:A list log the name(interanl) of the nodes/branches of intereset. INIT_STATE:This list is used to override the result of the .OP command if .IC command is specified.

pySpice.top module

pySpice.top.solve_circuit(infile, outfile)

Top Encapsulation of the Program

Parameters:

• infile – string specify the netlist’s name
• outfile – string specify the text report’s name