VSIN - Sinusoidal Voltage Source Model
Modified by Phil Loughhead on 4-Mar-2014
Model Kind
Voltage Source
Model Sub-Kind
Sinusoidal
SPICE Prefix
V
SPICE Netlist Template Format
@DESIGNATOR %1 %2 ?"DC MAGNITUDE"|DC @"DC MAGNITUDE"| SIN(?OFFSET/&OFFSET//0/
?AMPLITUDE/&AMPLITUDE//1/ ?FREQUENCY/&FREQUENCY//1K/ ?DELAY/&DELAY//0/
?"DAMPING FACTOR"/&"DAMPING FACTOR"//0/ &PHASE) #"AC MAGNITUDE"|AC @"AC
MAGNITUDE"| @"AC PHASE"
Parameters (definable at component level)
The following component-level parameters are definable for this model type and are listed on the
Parameters tab of the Sim Model dialog. To access this dialog, simply double-click on the entry for
the simulation model link in the Models region of the Component Properties dialog.
DC Magnitude
DC offset used in an Operating Point Analysis. (Default = 0).
AC Magnitude
the magnitude of the source when used in an AC Small Signal Analysis. (Default = 1).
AC Phase
the phase of the source when used in an AC Small Signal Analysis. (Default = 0).
Offset
DC offset voltage of the signal generator (in Volts). (Default = 0).
Amplitude
peak amplitude of the sinusoid (in Volts). (Default = 1).
Frequency
frequency of the sinusoidal output voltage (in Hz). (Default = 1K).
Delay
delay time until the source voltage commences (in seconds). (Default = 0).
the rate at which the sinusoid decreases/increases in amplitude (in 1/seconds). A positive value
Damping Factor results in an exponentially decreasing amplitude; a negative value gives an increasing amplitude.
A zero (0) value gives a constant amplitude sine wave. (Default = 0).
Phase
phase shift of the sinusoid at time zero (in Degrees). (Default = 0).
Notes
1. The image above shows an example waveform produced by a sinusoidal voltage source
(connected to a 1Ohm load). The Delay has been set to 500.0u and the Damping Factor set to
250 - to illustrate a decreasing sinusoid. All other parameters have been left at their default
values.
2. The shape of the waveform is described by the following formulae:
V(t to tD) = VO
V(tD to tSTOP) = VO + VA e
-(t - t
D)THETA sin(2πF (t + tD))
where,
t is an instance of time
VO is the DC offset voltage of the signal generator
VA is the maximum amplitude of the output swing (excluding the DC offset)
F is the Frequency
tD is the Delay and
THETA is the Damping Factor.
3. The simulation-ready sinusoidal voltage source component (VSIN) can be found in the
Simulation Sources integrated library (\Library\Simulation\Simulation
Sources.IntLib).
Examples
Consider the sinusoidal voltage source in the above image, with the following characteristics:
Pin1 (positive) is connected to net INPUT
Pin2 (negative) is connected to net GND
Designator is Vin
Frequency = 10k
All other parameters for the model are left at their default values.
The entry in the SPICE netlist would be:
*Schematic Netlist:
Vin INPUT 0 DC 0 SIN(0 1 10k 0 0) AC 1 0
Source URL: http://techdoc.altium.com/display/AMSE/VSIN+-+Sinusoidal+Voltage+Source+Model