What is transconductance, Electrical Engineering

Assignment Help:

Q. What is transconductance? Explain its significance from the transfer characteristics.

Transconductance is the transistor gain of the JFET; it indicates the amount of control the gate voltage has on the drain current. The transconductance is defined as

    gm = d(ID)/d(VGS)

Using the expression for the ideal drain currents derived, we can write the expressions for the transconductance.

The drain current for n-channel depletion mode device in the non-saturation region region was given by equation for the pinch off current.

The derivation of the equation for the transconductance leads to the relation shown below

    gms = (-2IDSS)(1-VGS/VP)/VP

The transconductance shows the significance of the transfer characteristics of a JFET.

1987_What is transconductance.png

The transfer characteristic of an FET relate the transfer of the input directly with the output. That is the drain current is directly plotted with the gate source voltage. The graph on the left slowly diminishes in its amplitude as it approaches the x axis. In theory the graph touches the x axis and channel pinches off. But in practical sense the graph does not tough the x axis but goes parallel to it with out touching it. For this reason the gm of the JFET is always a constant value. The transconductance of the JFET relates the ease with which the drain current flows at a particular value of the gate source voltage. The measure of transconductance is done in siemens.


Related Discussions:- What is transconductance

Calculate the power factor of the motor, A 3 phase 400 volt(line to line) w...

A 3 phase 400 volt(line to line) wye connected synchronous motor has Xs= 1 ohm per phase and a negligible armature resistance. The field current is so adjusted that the internal(in

Write short note on quantization, Q. Write short note on Quantization? ...

Q. Write short note on Quantization? Quantization: This is first step in PCM. Total amplitude range of the modulating signal is divided into a number of standard levels calle

Describe the magnetic effects of current, 1.   Describe the magnetic effe...

1.   Describe the magnetic effects of current? ( to achieve a pass grade, describe the magnetic effect of current) 2.   Complete the diagram to show the direction of mo

Explain about ''emitter follower'', Q. Explain about 'Emitter Follower'? ...

Q. Explain about 'Emitter Follower'? EMITTER FOLLOWER : An emitter follower circuit shown in the figure is widely used in AC amplification circuits. The input and output of the

Preventing leakages at insulators, Preventing Leakages at Insulators L...

Preventing Leakages at Insulators Leakages at insulators, cracking of insulators and flashover across insulators frequent cause outages and give output in loss of revenue. Pol

Introduction to problem based learning, The Problem Based Learning is an ap...

The Problem Based Learning is an approach to learning prepares the students to engage with challenges similar to real world problems.The VEB3001-Problem Based Learning has been an

Primacy of mosfet, Primacy of MOSFET In the year 1959, Dawon Kahng an...

Primacy of MOSFET In the year 1959, Dawon Kahng and Martin M. (John) Atalla at Bell laboratory invented the MOSFET. Operationally and structurally diverse from the bipolar ju

Model and simulaions, a short review article on the classification of time ...

a short review article on the classification of time frame

Find the magnetic-field force exerted on the moving bar, Consider the arran...

Consider the arrangement shown in Figure. A conductor bar of length l is free to move along a pair of conducting rails. The bar is driven by an external force at a constant velocit

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd