Markus Friedrich at 14:21, 23 January 2008

2008-01-23T14:21:54Z

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Back to [[Model import or creation]]

If a circuit should become a model in form of a subcircuit Models in (P)SPICE and TARGET 3001!: 

'''Example:''' Potentiometer with total resistance and wiper position in percent as parameters (SIM_SUBCKT1.T3001). 

'''Circuit:''' 
'''USER:''' Compose circuit in a schematic ([[Compose the circuit]]) 
'''INFO:''' The circuit can be composed of real and virtual components. 
'''INFO:''' Naturally only components may be used, which possess a model. 
'''INFO:''' The signal names ([[Edit the circuit]]) and component names should get meaningful names, so that the generated subcircuit gets a readable form. 

'''RESTRICTION:''' The subcircuit must be drawn on page 1 only! 

A subcircuit does not need to be simulated for its generation, but a subcircuit should be tested. The test circuit shall be designed only on the remaining pages (2-100). The connections between subcircuit and test circuit can be realized by reference symbols. Thus TARGET 3001! works like an integrated development environment (i.e. editor and test) for subcircuits. 

Parameters: 
See section "Edit component values" in chapter 8.1.3.2{8.1.3.2 Edit the circuit}. Math. expressions with and without variables can be also used as "numerical values". An math. expression must be set within curved parentheses. A variable must be introduced to the subcircuit as parameters (see below). 
'''USER:''' Enter {RG * P / 100} as component value for R2. 
'''USER:''' Enter {RG * ( 100 - P ) / 100} as component value for R1. 
'''INFO:''' The resistances of the potentiometer are defined as a function of wiper position P in percent and total resistance RG. 

'''Subcircuit generator:''' 
'''USER:''' Press the function key F9 in the schematic view (Also with the menu actions or the icon bar). 
'''TARGET:''' The main dialog for the simulation will be opened. 
'''USER:''' Call the subcircuit generator with the tools menu. 
'''TARGET:''' Subcircuit dialog will appear and the pure spice circuit will be generated from the schematic. 
'''USER:''' Enter name for the new subcircuit: POTI 
'''USER:''' Click in the nodes window with the right mouse button and select add in the popup menu. 
'''TARGET:''' All signals from the first page of the schematic, which are connected to a reference symbol, will be listed in a box. 
'''USER:''' Select node: IN 
'''INFO:''' Selected nodes will be removed from the box. 
'''USER:''' Repeat selection for all further nodes: OUT, GND 
'''USER:''' Click in the parameters window with the right mouse button and select add in the popup menu. 
'''USER:''' Enter parameter name: P 
'''USER:''' Enter its default value: 50 
'''USER:''' Repeat input for all further parameters: RG with default value=1K 
'''USER:''' Enter info: Potentiometer with total resistance and wiper position in percent 
'''INFO:''' Some information (date, project name, project level) will be inserted automatically by the subcircuit generator. 
'''USER:''' Enter level: ANALOG 

The complete subcircuit can be viewed as text, by clicking on "Edit/Show as text": 

.SUBCKT POTI IN OUT GND PARAMS: P= 50 RG= 1K 
TARGET3001-SUBCKT-GENERATOR 
DATE: 11.06.03 10:57:14 
PROJECT: C:\TARGET\TarV10\SimExamples\SIM_SUBCKT1.T3001 
PROJECTLEVEL: Standard ANALOG=+100 
Potentiometer with total resistance and wiper position in percent 
LEVEL: ANALOG 
RR1 out in {RG*(100-P)/100} 
RR2 GND out {RG*P/100} 
.ENDS 

Different versions of a subcircuit with its own level settings ([[Simulation on different levels]]) can be generated. These settings will be documented in the comment line PROJECTLEVEL of the subcircuit. 
'''USER:''' Quit subcircuit dialog with the OK button. 
'''TARGET:''' The generated subcircuit will be stored in its own target project (*.T3001)! 
'''TARGET:''' The inputs that have been made in the subcircuit dialog will be stored graphically in the first page of the schematic. 
'''INFO:''' The line "PROJECTTYPE: SUBCKT" marks the project as a subcircuit project (important for simulation/test). 

Simulation (Test): 
USER: [[Simulate the circuit]] 

Using the created subcircuit: 
'''USER:''' [[Import extern models]] 
'''But in contrast:''' Select "TARGET project" in the menu "Reload from...". The model browser will show the generated subcircuits at the top of the list with the info SUBCKTGENERATOR! 

[[category:Simulation]]
[[de: Modelle mit dem Subcircuitgenerator schreiben]]

Drawing models with the subcircuit generator - Revision history

Markus Friedrich at 14:21, 23 January 2008