A test fixture for testing diode reverse recovery in a simulation-friendly way:

                       +---+         +----+
        +-- 10 ----+-->| R |-------->| A+ |
        |          |   +---+         |    |
        |          |                 |    |
    +---------+    |        +-------<| C- |
    |   +     |   R (SCA)   |        +----+
    | V:Pulse |    |        |         DUT
    |   -     |    |        |
    +---------+    |        |
        |          |        |
        +----------+--------+

The V source starts at +V_rev, with R selected to push I_fwd amps through the forward-biased diode, assuming it has a typical voltage drop of 0.7V (much smaller than the voltage source, so doesn't have to be exact or even really accounted for).

There is a high-value resistance in parallel with the V source for SCA (SPICE convergence aid), as with many V and B sources throughout. (Usually, SCA resistors are not shown on the diagram.)

To drop the current at the specified rate of dIdt, the V source goes from full positive to zero in time I_fwd / dIdt:

   +---//--------------------------//-------------+
   |:       :         :               :           |
   |:--//---,         :               :         ,-|
   |:       :\        :               :        /  |
   |:       : \       :               :       /   |
   |:       :  \      :               :      /    |
   |:       :   \     :               :     /     |
   |.............\........................./......|
   |:       :     \   :               :   /       |
   |:       :      \  :               :  /        |
   |:       :       \ :               : /         |
   |:       :        \:   V:Pulse     :/          |
   |:       :         '---------------' <----------- V_rev
   |:       :         :               :           |
   +:--//---:---------:------------//-:-----------+
    :       :         :               :
    :       :         :               :
   +:--//---:---------:------------//-:-----------+
   |:       :         :               :           |
   |:--//---,     <--- I_fwd          :           |
   |:       :\        :               :           |
   |:       : \       :               :           |
   |:       :  \      :               :           |
   |:       :   \     :        Iac    :           |
   |:..//........\........ ,,------//-:-----------|
   |:       :     \   :   /           :           |
   |:       :      ''---''            :           |
   |0       ts        ts+tr           ts+tr+tp    |
   +:--//---:---------:------------//-:-----------+
    :       :
    :       +------- Beginning of "rise" time
    +------------Beginning of TRAN simulation

Instance Variable	V_rev	The cathode-anode voltage at full reverse bias.
Instance Variable	I_fwd	The forward current supplied at full forward bias.
Instance Variable	dIdt	The derivative of diode current as it transitions from forward to reverse bias.
Static Method	timing	Returns pulse start time ts, rise (and fall) time tr, and pulse width time tp.
Method	setup	Subcircuit definition.

Inherited from NodeStuff (via Subcircuit):

Instance Variable	shunts	A dict of current sensing V elements with the pairs of nodes they connect.
Class Variable	debug	A `Bag` that gets set `True` for all instances to log info about each `setup` call.
Class Method	autoName	Undocumented
Method	setupResults	Undocumented
Method	fill	Undocumented
Method	nodeCheck	Call with the circuit building tool f and a sequence of nodes provided to this `Include` or `Subcircuit`.
Method	rawNetlist	Get lines of a raw netlist from a search hierarchy of possible sources.
Method	shunt	Call to insert a current-measuring shunt and add an entry to my `Elements` baton's dict of shunts.
Method	raw	See `Elements.raw`.
Method	iNode	See `Elements.iNode`.
Method	ground	See `Elements.ground`.
Method	sca	See `Elements.sca`.
Method	sca6	See `Elements.sca6`.
Class Method	_libDir	Undocumented
Method	_strippedLines	Undocumented
Method	_call_setup	Calls my `setup` method (almost always your override of that method, actually) and processes any return value.

Inherited from NodeStuff (via Subcircuit):

Instance Variable	shunts	A dict of current sensing V elements with the pairs of nodes they connect.
Class Variable	debug	A `Bag` that gets set `True` for all instances to log info about each `setup` call.
Class Method	autoName	Undocumented
Method	setupResults	Undocumented
Method	fill	Undocumented
Method	nodeCheck	Call with the circuit building tool f and a sequence of nodes provided to this `Include` or `Subcircuit`.
Method	rawNetlist	Get lines of a raw netlist from a search hierarchy of possible sources.
Method	shunt	Call to insert a current-measuring shunt and add an entry to my `Elements` baton's dict of shunts.
Method	raw	See `Elements.raw`.
Method	iNode	See `Elements.iNode`.
Method	ground	See `Elements.ground`.
Method	sca	See `Elements.sca`.
Method	sca6	See `Elements.sca6`.
Class Method	_libDir	Undocumented
Method	_strippedLines	Undocumented
Method	_call_setup	Calls my `setup` method (almost always your override of that method, actually) and processes any return value.

V_rev =

The cathode-anode voltage at full reverse bias.

I_fwd =

The forward current supplied at full forward bias.

dIdt =

The derivative of diode current as it transitions from forward to reverse bias.

@staticmethod
def timing(I_fwd, dIdt):

Returns pulse start time ts, rise (and fall) time tr, and pulse width time tp.

def setup(self, f):

overrides pingspice.circuit.netlist.Subcircuit.setup

Subcircuit definition.

Why use f? Because it's short and a conveniently typed letter on the keyboard.

Override this if your subclass does not reference a param.ParameterFinder subclass via the Finder class attribute. As with Include.setup, your override method can return a dict of attribute names and values to set in my instance.

API Documentation for pingspice, generated by pydoctor at 2021-09-18 08:41:11.

pingspice.analysis.fixture.DiodeRecoveryFixture(Subcircuit) class documentation

`pingspice.analysis.fixture.DiodeRecoveryFixture(Subcircuit)` class documentation