Contents
What causes the oscillation of a capacitor in PSpice?
This changes admittance for the capacitor from 15 nF to 18 nF, which changes the frequency of oscillation. The .IC statement causes PSpice to begin simulation with an initial condition of 1 volt on node Ref1 to begin the oscillation.
Can a voltage controlled resistor change its value?
While the value can be made to change through a fixed sequence of values, for a set of simulations using parametric sweep, a voltage-controlled resistor can be made to change its value dynamically during a simulation. This is illustrated by the circuit shown in Figure 1. The circuit uses a voltage- controlled resistor, X_VCRes.
What are the parameters of the PSpice reference guide?
Input/output model parameters 328 Digital/analog interface devices 330 Digital input (N device) 330 Digital input model parameters 331 Digital output (O Device) 334 Digital output model parameters 334 Digital model libraries 338 7400-series TTL and CMOS library files 339 4000-series CMOS library 339 Programmable array logic devices 340
How to use PSpice in a design flow?
PSpice is just one element in our total solution design flow. How to Use This Online Manual Overview xiv Overview This manual contains the reference material needed when working with special circuit analyses in PSpice.
How to calculate the capacitance of a circuit?
A capacitor model with C0=1, C1=2,C2=0 is used in the circuit on right-side in Figure 7, making capacitance value Co + C*V + C*V*V. Simulation results of both the circuits are shown below in Figure 8.
How to model a voltage variable capacitor circuit?
Some time designers need to model a voltage variable capacitor. The following example circuit file describes a test circuit that contains a voltage-variable capacitor. This capacitor is constructed by way of a TABLE function embedded in the VALUE extension to the G (voltage-controlled current source) device.
How is the time derivative of a capacitor measured?
In the subcircuit, the time derivative, dV (t)/dt, is measured by applying a copy of the voltage across Gout to a known capacitance, Cref, and monitoring its current. The C (V) function in the subcircuit is arbitrary. The value of the nonlinear capacitor model in this example has a second order polynomial dependence on its voltage.
How is a nonlinear capacitor modeled in a subcircuit?
The nonlinear capacitor is modeled by a subcircuit in which the capacitor is replaced by a controlled current source, Gout, whose current is defined by (2b). In the subcircuit, the time derivative, dV (t)/dt, is measured by applying a copy of the voltage across Gout to a known capacitance, Cref, and monitoring its current.