11/6/2022 0 Comments Pspice schematics placing a node![]() ![]() ![]()
Program registration is required to enter values for these parameter from the schematic, otherwise the default values are used.ĥSpice also allows defining parameters inside a subcircuit using. This includes the formula for Spice’s B source. The parameter must be enclosed with braces where it is used in the subcircuit. SUBCKT ACamplifier 2 1 3 PARAMS: Cin=10n Rbias=2KĥSpice requires that all parameters be listed on the. SUBCKT line works with 5Spice, PSpice, IsSpice and possibly others. The following shows the previous subcircuit but with the values of R1 and C1 as parameters. Note: If you have a file with two subcircuits (Sub1,Sub2) that both call a third (Sub3), you can write Sub3 as a separate subcircuit in the same file.Įxample – Passing Parameters to the subcircuitĥSpice and high end Spice simulators allow a subcircuit to accept parameter values passed from the schematic or from the subcircuit call line. #Pspice schematics placing a node manual#Nodes 1,2,3 need to connect externally to provide power and get a signal in and out of the subcircuit.Ĭhoose a name for the subcircuit: ACamplifierĬonsult Spice manual for syntax details for each type of partĬomment lines start with * * external nodes: in power out Number the circuit nodes 1 to 5 in any order. The last line in a subcircuit definition is the. The circuit element lines which immediately follow the. subckt line that determines their external connection, NOT their name or number! 0 (zero) is not allowed as an external node. Only these nodes connect outside the subcircuit. In 5Spice the maximum length for the name is 32 characters and the following characters may not be used in the name: ~ # ?. The name consists of letters and numbers from the English alphabet. non-English speaking countries: numbers in Spice must be written as 1.23 (not as 1,23)Ī subcircuit definition begins with the.circuit nodes may be identified with either numbers or letters.SUBCKT line are strictly local with one exception: Spice defines node 0 (zero) as circuit ground in both circuits and subcircuits. Any circuit nodes not included on the.Any device models or subcircuit definitions included in a subcircuit definition are strictly local (these models and definitions are not known/visible outside the subcircuit definition).Spice sees “SPICE” and “spice” as the same.When a line is too long to fit, break the line and use the + symbol as the first character of the extension line. ![]()
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