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

Show implementation of synchronous counter using d flip-flop, Q. Consider t...

Q. Consider the synchronous counter shown in Figure of the text. (a) Draw its timing diagram. (b) Show the implementation of the same synchronous counter using D flip-flops.

Band Pass active filter, How to design band pass active filer? Any software...

How to design band pass active filer? Any software avaialble

Var compensators employing flexible ac transmission system, Var Compensator...

Var Compensators Employing Flexible AC Transmission System Devices These are a new generation of VAr compensators which employ solid-state devices (thyristors) for the generati

Sr flip flop - introduction to microprocessors , SR Flip Flop The SR  f...

SR Flip Flop The SR  flip  flop is an arrangement  of logic gates that maintain astable output even after  the  input  are turned off.  It has  two  inputs namely  SET input (S

Grade of service in loss systems, Q. Grade of Service In loss systems? ...

Q. Grade of Service In loss systems? Grade of Service : In loss systems, traffic carried by the network is normally lower than actual traffic offered to the network by subscri

Thunderstrom detector, Ask question #how to construct thunderstrom detector...

Ask question #how to construct thunderstrom detector with circuit breaker.

Decision making, Decision  Making The rhombus diamond symbol  is used...

Decision  Making The rhombus diamond symbol  is used to represent  the decision making  process  as shown  below.                                          Figure  De

Dc motor, write the working and construction of dc motor.

write the working and construction of dc motor.

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