![]() JFETs are also less susceptible to electrostatic discharge than MOSFETs. JFETs can even serve as an input surge-protection device. JFETs can withstand electrical, electromagnetic interference (EMI) and other high radiation shocks better than MOSFET circuits. Īnother reason discrete JFETs are used is that JFETs are better suited for rugged environments. In these applications, low-noise JFETs allow more reliable and accurate measurements and heightened levels of sound purity. One reason is that JFETs and circuit topologies built with JFETs feature low-noise (specifically low 1/ f flicker noise and low burst noise). JFETs for VCRs are often packaged in pairs, which allows VCR designs that require matched transistor parameters.įor VCR applications that involve sensor signal amplification or audio, discrete JFETs are often used. Typically, JFETs when they are packaged as VCRs often have high pinch-off voltages, which result in a greater dynamic resistance range. ![]() ![]() So much so, that JFET devices are packaged and sold as voltage-controlled resistors. The JFET is one of the more common active devices used for the design of voltage-controlled resistors. Voltage-controlled resistors are one of the most commonly used analog design blocks: adaptive analog filters, automatic gain-control circuits, clock generators, compressors, electrometers, energy harvesters, expanders, hearing aids, light dimmers, modulators (mixers), artificial neural networks, programmable-gain amplifiers, phased arrays, phase-locked loops, phase-controlled dimming circuits, phase-delay and -advance circuits, tunable filters, variable attenuators, voltage-controlled oscillators, voltage-controlled multivibrators, as well as waveform generators, all include voltage-controlled resistors. ![]() Grounded VCRs, the more common and less complicated design, require that one port of the voltage-controlled resistor be grounded. Floating VCRs can be placed between two passive or active components. There are both floating voltage-controlled resistors and grounded voltage-controlled resistors. Two types of FETs are often used: the JFET and the MOSFET. VCRs are most often built with field-effect transistors (FETs). ![]() The input-port voltage controls the value of the resistor between the output ports. A voltage-controlled resistor (VCR) is a three-terminal active device with one input port and two output ports. ![]()
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