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General form:
SIN(VO VA FREQ TD THETA)
Examples:
VIN 3 0 SIN(0 1 100MEG 1NS 1E10)
| parameter | default value | units | 
| VO (offset) | - | Volts or Amps | 
| VA (amplitude) | - | Volts or Amps | 
| FREQ (frequency) | 1/TSTOP | Hz | 
| TD (delay) | 0 | seconds | 
| THETA (damping factor) | 0 | 1/seconds | 
The shape of the waveform is described by the following table:
| time | value | 
| 0 to TD | V0 | 
| TD to TSTOP | 
 |