✔ Voltage Controlled Resistor Spice

Voltage Controlled Resistor Spice

- August 08, 2019

In this video we will be looking at the voltage controlled witch componant in ltspice as well as a way to create a voltage controlled resistor using a resistor voltage source and some simple math operations to tie it all together. A voltage controlled resistor vcr may be defined as a three terminal variable resistor where the resistance val ue between two of the terminals is controlled by a voltage potential applied to the third.

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In this case the voltage deltar is a triangle wave with a value that starts at zero volts and has a maximum of one volt.

Voltage controlled resistor spice. This special resistor is defined using the zx subcircuit from anlmisclib. The param function defines the value of the vcr and the voltage from the voltage source v2 or any node in your circuit is the multiplier to obtain the variable resistor value. In this application note we will illustrate.

This subcircuit consists of two controlled sources and employs an external reference component that is sensed. How to simulate a variable resistor in ltspice ensure lt spice is completely maximized create a circuit how you normally would with normal resistors set the. To sense current spice uses a voltage source vsense 0v.

Of resistor that you want to be variable to be r click on op far right on the toolbar type. They of course have no effect on circuit operation since they represent short circuits. The output impedance equals the value of the control voltage times the reference.

The other source eres generates the voltage across the resistor based on the sensed current times your desired resistance valueivsense10k. Modeling voltage controlled resistors and capacitors in pspice the anlmisclib library file contains subcircuit models for voltage controlled reactances and admittances. These can be used to make voltage controlled resistors and capacitors.

Voltage controlled switch and resistor. Voltage sources in addition to being used for circuit excitation are the ammeters for spice that is zero valued voltage sources may be inserted into the circuit for the purpose of measuring current. Step param r 1 10k 1k steps from 1 to 10k in 1k increments.

The circuit uses a voltage controlled resistor xvcres. Its set to 0v so theres no effect on the output voltage.