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Designer File Formats > Subcircuit Instance StatementTo create an instance of a subcircuit, the netlist adds an X-element statement: Xxxx circuit_nodes sub_name [local_params] [M=val] The subcircuit instance name must begin with the letter X (or x), followed by any number of valid device name characters. See Device Instance Names for the list of valid characters. The circuit nodes in the X-element statement are the nodes in the actual circuit that connect to the boundary_nodes in the order given by the subcircuit definition. The sub_name is the name of the subcircuit definition to instantiate. The optional M parameter on a subcircuit instance statement specifies a value that multiplies the value of the M model parameter in every Nexxim device instance referenced in the subcircuit. For example, suppose the netlist contains the following statements: .SUB MTEST 1 2 3 4 When subcircuit X1 is instantiated, its parameter setting M=2 causes the instance of MOSFET M1 to have an effective instance parameter M=2, since by default the MOSFET instance parameter M has value 1. MOSFET M2 will have an effective instance parameter M=6 (3 times 2). Here is the basic definition for the subcircuit LINESEG that combines the two subcircuits to make one segment of a lossy transmission line: .SUBCKT LINESEG insig inref outsig outref Xleft insig local1 sub1 Xright outsig local1 sub1 Xmid local1 local2 sub2 Rleft inref local2 ser_res Rright local2 outref ser_res .ENDS Here is a circuit fragment that builds a multi-segment transmission line by connecting together two instances of subcircuit LINESEG. * Lossy transmission line fragment Xtrans1 send1 GND 10 20 LINESEG Xtrans2 10 20 rcv1 GND LINESEG
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