Voltage Controlled Resistor

This is because voltage current x resistance.

Voltage controlled resistor. The jfet and the mosfet there are both floating voltage controlled resistors and grounded floating. For a junction field effect transistor jfet under certain operating conditions the resistance of the drain source. Make a voltage controlled resistor2 use it to make a voltage controlled oscillator3 use it to feed a signal into a laptop s microphone input the voltage controlled resistor is a very useful element in electroni. In the ohmic region1 the drain to source current i ds depends on the gate to source.

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. There are two distinct regions. Vcrs are most often built with field effect transistors fets. One of the simplest uses of a voltage controlled resistor is an electronically controlled attenuator or volume control.

The output of the op amp turn on and control the mosfet until the voltage drop across the shunt resistor became 4v. The field effect transistor as a voltage controlled resistor we consider the use of a n channel fet as a voltage controlled resistor where the resistance between the drain and source is controlled by the gate source voltage. This is a three in one instructable 1. All you need is a controlling voltage to multiply the resistor value.

In 1998 linear technology hired mike engelhardt to re write spice to allow simulation of linear circuits with primary emphasis on switching power supplies. The input port voltage controls the value of the resistor between the output ports. Basic voltage controlled resistor vcr circuits. A simple addition to the above resistor model gives you a voltage controlled resistor.

V i x r x vc. The basic circuit forms a voltage divider as shown in figures 3 4 5 and 6. The ohms law is applied in this scenario. The resistor will only produce 4v drop if the current through the resistor will 400ma 4a.

Here s a subcircuit for this device subckt vc res1 10k 1 2 4 5 eres 1 3 value i vsense 10k v 4 5 vsense 3 2 dc 0v ends. A voltage controlled resistor vcr is a three terminal active device with one input port and two output ports. Make a voltage controlled resistor and use it. A voltage controlled resistor béla géczy ltspice is one of the world s leading circuit simulation tools.