MiscEl: Two port

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This page is designed to convert between different 2 port specification and can also do some calculation on a 2 port circuit. It is possible to select between letters and number syntax and select with and without complex values.
Parameters can be specied in any of these formats (with a few exceptions) and express exactly the same behavior.
It is also possible to select a circuit and have it converted to a two port representation and draw a curve of some circuit parameters dependency on frequence.

Two ports supported

Input values

The input values will depend on the selected sensor type.
Model typeSelect model displayet and used for output result
Input modelModel used for input parameters
Z/Y/H/G/A/BFirst used to designate model in parameters
i or 11 Input parameter
r or 12Reverse parameter, how signal on output affects input
f or 21Forward parameter, how signal on input affects output (i.e. Hfe is hybrid model, forward(gain) in commen emitter circuit)
o or 22Output parameter
i or Pimaginary part or Phase angle of value
Source ZImpedance of source circuit
Load ZImpedance of load circuit
Input UVoltage from source circuit
CurveOpens the "Curve plotter page" and show the frequence response of the defined circuit.
This selection will only be available when a circuit is selected, Source Z and Load Z are real values
LettersWhen checked the i/r/f/o indices are used, else 11/12/21/22 indices are used
ComplexWhen checked all input can be complex numbers. Output will display complex values when required.
Phase inputWhen checked specify all input values as phase angle
Phase outputWhen checked all complex output is shown as phase angle

Output values

FormulasFormulas are show for both input and output models
Z/Y/H/G/A/BThe parameters from the input model converted to the output model
Source/load values are ignored
ZinInput impedance of model when output is unloaded
ZoutOutput impedance of model when input unconnected
GainVoltage/current gain when output unloaded/shorted
ReversVoltage/current revers (output to input) gain when input unloaded/shorted)
With specified source and load (Requires selection of "Use")
ZiInput impedance of model when using specifed Zout
ZoutOutput impedance of model when using specified Zin
AvVoltage gain of model when using specified Zout, based on voltage at input terminals
AiCurret gain of model when using specified Zout, based on current into input terminals
ViVoltage at input terminal when supplying "Input U" from specified "Source Z" and output is loaded with "Load Z"
IiCurrent into input terminal when supplying "Input U" from specified "Source Z" and output is loaded with "Load Z"
VoVoltage at output terminal when supplying "Input U" from specified "Source Z" and output is loaded with "Load Z"
IoCurrent into output terminal when supplying "Input U" from specified "Source Z" and output is loaded with "Load Z"
Alternate parameter names
Only used for "Transmission" and "Inverse transmission" model, because parameters are some times called ABCD/EFGH and not the usual names.

Circuits

When using circuits the displayed two-port parameters are calculated at the specified frequence, but the curves are made from a frequence sweep.

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