This is useful for modeling the characteristics of a load. The current can also be specified as a function of the voltage across the output nodes with a look-up table. Time-dependent single-frequency FM current source. Syntax: Ixxx n+ n- SFFM(Ioff Iamp Fcar MDI Fsig) For times between Td1 and Td2 the current is given by>įor times after Td2 the current is given by Time-dependent exponential current source Nameįor times less than Td1, the output current is I1. Syntax: Ixxx n+ n- EXP(I1 I2 Td1 Tau1 Td2 Tau2)
The damping factor, Theta, is the reciprocal of the decay time constant. Nameįor times less than Td or times after completing Ncycles, have run, the output current is given byIoffset+Iamp*sin(pi*phi/180)Otherwise the current is given by Syntax: Ixxx n+ n- SINE(Ioffset Iamp Freq Td Theta Phi Ncycles) Number of cycles(Omit for free-running pulse function) Time-dependent pulsed current source Name Syntax: Ixxx n+ n- PULSE(Ioff Ion Tdelay Trise Tfall Ton Tperiod Ncycles) The purpose of this option is to model a current load on a power supply that doesn't draw current if the output voltage is zero.įor AC analysis, the value of AC is used as the amplitude of the source at the analysis frequency.
If the source is flagged as a load, the source is forced to be dissipative, that is, the current goes to zero if the voltage between nodes n+ and n- goes to zero or a negative value. This circuit element sources a constant current between nodes n+ and n.
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