3.19 S: Voltage Controlled Switch
3.19.1 Syntax
Device
Sxxxxxxx n+ n– nc+ nc– mname {ic}
.vswitch label n+ n– nc+ nc– mname {ic}
Model (required)
.model mname SW {args}
3.19.2 Purpose
Voltage controlled switch.
3.19.3 Comments
N+ and n– are the positive and negative element nodes,
respectively. Nc+ and nc– are the controlling nodes.
Mname is the model name. A switch is a resistor between n+ and n–. The value of the resistor is determined by the
state of the switch.
The resistance between n+ and n– will be RON
when the controlling voltage (between nc+ and nc–) is
above VT + VH. The resistance will be ROFF when
the controlling voltage is below VT - VH. When the
controlling voltage is between VT - VH and VT +
VH, the resistance will retain its prior value.
You may specify ON or OFF to indicate the initial state
of the switch when the controlling voltage is in the hysteresis
region.
RON and ROFF must have finite positive values.
3.19.4 Model Parameters
- VT = x
- Threshold voltage. (Default = 0.)
- VH = x
- Hysteresis voltage. (Default = 0.)
- RON = x
- On resistance. (Default = 1.)
- ROFF = x
- Off resistance. (Default = 1e12)
3.19.5 Probes
The standard probes for all basic elements are all available. See the
print command for documentation.
- DT
-
Time step. The internal time step used for this device. It is not
necessarily the same as the global time step.
- TIME
-
Time. The time of the most recent calculation of this device. It is
not necessarily the same as the global time.
- TIMEOLD
-
The time of the previous calculation of this device. It is not
necessarily the same as the global time.
- TIMEFUTURE
-
The latest recommended time for the next sample, as determined by this
device. This is usually an estimate of the time the device will switch.