| Pulse waveform |
Any independent source can be assigned a time-dependent value for transient analysis. The general form of pulse waveform is:
| PULSE ( <V1> <V2> [TD [TR [TF [PW [PER [PHASE]]]]]] ) |
You must specify a value for the parameters V1 and V2. the remaining parameters, if not specified, assume a default value.
| Parameter | Description | Units | Default |
| V1 | Initial amplitude of the output with respect to the negative terminal (usually ground). | V o A | |
| V2 | Pulsed value. Maximum amplitude of the output swing. | V o A | |
| TD | Time delay. Delay before the source changes from Initial to Pulsed. | s | 0 |
| TR | Rise time. Time it takes to rise from Initial Voltage to Pulsed Voltage. | s | TSTEP |
| TF | Fall time. Time it takes to fall from Pulsed Voltage back to Initial Voltage. | s | TSTEP |
| PW | Pulse width. Time that the source remains at Pulsed Voltage. | s | TSTOP |
| PER | Period. Time between the start of the first pulse to the start of the second pulse. | s | TSTOP |
| PHASE | Phase. | degree | 0 |
TSTEP is the printing increment and TSTOP is the final time (see the .TRAN control line for explanation).
VIN 3 0 PULSE(-1 1 2NS 2NS 2NS 50NS 100NS)