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Subsections
Cxxxxxxx n+ n- value
Cxxxxxxx n+ n- expression
Cxxxxxxx n+ n- value {IV=initial-voltage}
.CAPacitor label n+ n- expression
Capacitor, or general charge storage element.
The following probes are available in addition to those available for
all basic elements.
- DT
- Time step. The internal time step used for this
device for numerical integration. 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 time for the next sample, as
determined by this device.
- CHarge
- The charge stored in this capacitor.
- Q
- The same as Charge.
- Capacitance
- The effective capacitance of this device.
For a fixed capacitor, it is constant, but it will vary if it is
nonlinear.
- DQDT
- The time derivative of charge. Hopefully this is
the same as current, but it is calculated a different way and can be
used as an accuracy check.
- DQ
- The change in charge compared to the previous sample.
Its primary use is in debugging models and numerical problems.
N+ and n- are the positive and negative element nodes,
respectively. Value is the capacitance in Farads.
The (optional) initial condition is the initial (time = 0) value of the
capacitor voltage (in Volts).
Note that the initial conditions (if any)
apply only if the UIC option is specified on the transient
command.
Next: Trans-capacitor
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Al Davis
2000-09-04