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Nexxim Simulator > Voltage Source, Exponential (Netlist Only)
Exponential Voltage Source Netlist FormatThe format for specifying an exponential current source is: Vxxxx n+ n- EXP (v1 v2 [td1 [td2 [t1 [t2]]]]) n+ is the positive node and n- is the negative node of the voltage source. Parameters in parentheses are positional. The first two (v1 and v2) are required. The remainder (td1, td2, t1, and t2) can be omitted, but the parameters must be entered in the order given. To guarantee that a given parameter is interpreted correctly, all parameters to the left of it must be present.
Exponential Voltage Source Netlist Example.TITLE VEXP TEST V1 1 0 EXP(-4 -1 5ns 30ns 80ns 40ns) R1 1 0 1 .TRAN 0.5ns 200ns .PRINT V(1) .END Notes1. The td2, t1, and t2 parameters take their default values from the step argument on the transient analysis TRAN statement (see Transient Analysis Netlist Format). Therefore, when a circuit containing an exponential voltage source is to be analyzed with a tool other than transient analysis, the td2, t1, and t2 parameters must be given explicit values. 2. The exponential voltage source exhibits an 'overshoot' when the first time period is small relative to the first decay constant. 3. Exponential Voltage Source Equations: From time = 0 to time = td1: Output = v1 From time=td1 to time = td2: Output = v1 + (v2 - v1) ´ (1.0 - EXP[-(time - td1) / t1] From time = td2 to time = tstop: Output = v1 + (v2-v1) ´ (1.0 - EXP[-(time-td1) / t1] ) - (v2 - v1)´ (1.0 - EXP[-(time-td2) / t2] )
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