Variable Resistor with Constant Capacitor
Purpose
Controlled resistance in parallel with constant capacitance
Library
Electrical / Passive Components
Description
This component models a variable resistor with a constant capacitor connected in parallel. The resistance is determined by the signal fed into the input of the component. It may not be set to zero.
Note In this component the resistor is implemented as a voltage-dependent current source. Without the parallel capacitor, which fixes the momentary voltage, this would result in an algebraic loop. Therefore, the capacitance may not be set to zero.
Parameters
- Capacitance
- The value of the capacitor, in farads (F). All finite positive and
negative values are accepted, excluding 0. The default is 100e-6.
In a vectorized component, all internal capacitors have the same value if the parameter is a scalar. To specify the capacitances individually use a vector
. The length
of the vector determines the width of the component.
- Initial voltage
- The initial voltage of the capacitor at simulation start, in volts (V). This parameter may either be a scalar or a vector corresponding to the width of the component. The positive pole is marked with a "+". The initial voltage default is 0.
Probe Signals
- Capacitor voltage
- The voltage measured across the capacitor, in volts (V). A positive voltage is measured when the potential at the terminal marked with "+" is greater than the potential at the unmarked terminal.