## SPEED

Speed Source
Function Translational speed source with a dc or time dependent value in (m/s).
Format Name:
Vxxxxxxx Name of the element, including the first character a maximum of 8 characters is allowed.Value:
< DC value > < Transource >
DC value
Dc value of the source. If omitted, the source has a value zero, or a time dependent behavior, if one of the Transources is specified.Transource
You can specify a time dependent transource. The time dependent sources are described on the following pages.
Transource is chosen from: Pulse, Sinusoidal, Exponential, Piece-Wise-Linear or Single-Frequency fm

### Pulse

(To be specified as Value for the voltage source or current source)

PULSE(V1 V2 TD TR TF PW PER)
 parameters default value units V1V2TDTRTFPWPER initial valuepulse valuedelay timerise timefall timepulse widthperiod 000dTdTTstopTstop volts or ampsvolts or ampssecondssecondssecondssecondsseconds

The following table specifies a single pulse:
 Time Value t=0t=TDt=TD+TRt=TD+TR+PWt=TD+TR+PW+TFt=Tstop V1V1V2V2V1V1
Each period PER the pulse is repeated. Intermediate points are determined by linear interpolation.
Example:
Value: pulse = -2 2 2ps 2ps 4ps 20ps 100ps
Value: pulse(-1,1,2,2,2)
Value: Pulse=(0,10,0,0,0,10n,40n)

### Sinusoidal

(To be specified as Value for the voltage source or current source)

SIN(VO VA FREQ TD THETA)
 Parameters Default values Units VOVAFREQTDTHETA OffsetAmplitudeFrequencyDelay timeDamping factor 001/Tstop00 volts or ampsvolts or ampsHertzseconds1/seconds

The following table describes the waveform:
 Time Value 0<=t<=TD VO TD<=t<=Tstop VO+VA*exp(-(time-TD)*THETA)*sin(2*PI*FREQ*(time-TD))

Example:
Value: sin 0 220 50
Value: sin -1 2 20khz 2seconds 5
Value: sin(0,1,4.77meg)

### Piece-Wise Linear

(To be specified as Value for the voltage source or current source)
PWL(T1 V1 <T2 V2 T3 V3 T4 V4 .....>)
Parameters
Ti Time when the new value starts.
Vi Pulsed value.
Each pair of values (Ti, Vi) specifies that the value of the source is Vi (in volts or amps) at time t=Ti. The value of the source at intermediate values of time is determined by linear interpolation of the values.
Example:
Value: pwl 1 1 2 2 3 1 4 2 5 1 6 2
Value: pwl=1,0 2,2 3,2 4,0
Value: pwl(1.000034ns,2.234)

### Exponential

(To be specified as Value for the voltage source or current source)

EXP(V1 V2 TD1 TAU1 TD2 TAU2)
 Parameters Default values Units V1V2TD1TAU1TD2TAU2 initial valuepulsed valuerise delay timerise time constantfall delay timefall time constant 000dTTD1+dTdT volts or ampsvolts or ampssecondssecondssecondsseconds

The following table describes the waveform:
 Time value 0<=t<=TD1 V1 TD1<=t<=TD2 V1+(V2-V1)*(1-exp(-(time-TD1)/TAU1)) TD2<=t<=Tstop V1+(V2-V1)*(1-exp(-(time-TD1)/TAU1))+(V1-V2)*(1-exp(-(time-TD2)/TAU2))

Example:
Value: (exp = 0,-1) ( 3ns 3ns 10ns 10ns )
Value: EXP(-1,1,2,3)
Value: EXP=100 0 1ns

### Single-Frequency FM

(To be specified as Value for the voltage source or current source)
SFFM(VO VA FC MDI FS)
 Parameters Default value units VOVAFCMIDIFS Offsetamplitudecarrier frequencymodulation indexsignal frequency 001/Tstop 00 volts or ampsvolts or ampsHertz1/seconds

The shape of the waveform is described by the following equation:
value = VO + VA*sin((2PI*FC*time)+MDI*sin(2PI*FS*time))
Example:
Value: sffm 0 5 1meg
Value: sin -1 2 20khz 2seconds 5
Value: sin(0,1,4.77meg)

Special It is not allowed to make a parallel connection between speed sources.
Example Name: V_Speed_1
Value: 120

Name: V_SpeedSource
Value: sin 9,0.02 50hz

Name: V_SpeedPulse
Value: pulse 0,1 1,1,1,10,100
Select from Components/Circuit/Translational