Voltage Controlled Resistor Applications

- February 16, 2019

The output impedance equals the value of the control voltage times the reference. Two types of fets are often used.

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This voltage is converted to a current signal and is applied to the capacitor.

Voltage controlled resistor applications. From the fact that the control signal is well isolated from the resistor terminals. In this application note we will illustrate the usage of voltage controlled impedance for controlling q of a series rlc filter network and changing the frequency of a wien bridge oscillator. Why are mosfets better than bjts in application of voltage controlled resistor.

If such a device should be able to act as a voltage controlled resistor it should have a voltage current characteristic that is at least similar to an ohmic resistor. For a voltage controlled oscillator generating a saw tooth waveform the main component is the capacitor whos charging and discharging actually decides the formation of the output waveform. These can be used to make voltage controlled resistors and capacitors.

Parameter sweep of control voltage. This circuit employs an external reference component that is sensed. Application 1 note.

Here we will use rref a 50 ohm resistor as our. Vcrs are most often built with field effect transistors fets. The input port voltage controls the value of the resistor between the output ports.

Make a voltage controlled resistor 2use it to make a voltage controlled oscillator 3use it to feed a signal into a laptops microphone input. 48a shown conceptually in fig. A voltage controlled resistor vcr is a three terminal active device with one input port and two output ports.

The one in this instructable takes a minute to make and does not require too much electronic knowledge to operate. The voltage controlled resistors find applications in the area of analog signal processing such as filters dividers amplifiers and oscillators etc. For a junction field effect transistor jfet under certain operating conditions the resistance of the.

Avoltage controlled attenuator as one example the circuit in fig. 48b represents a voltage controlled attenuator in which the voltage transfer through the circuit can be varied electronically. The nature of vcrs 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.

Thanks for your responses. The jfet and the mosfet. The voltage controlled resistor is a very useful element in electronics.

Which employs a voltage controlled resistor. The input is given in form a voltage which can be controlled. The paper presents fgmos based voltage controlled resistor operating at supply voltage of 075 v.