What transconductance means?

Glossary Term: Transconductance Definition. The gain of a transconductance amplifier (an amp in which a change in input voltage causes a linear change in output current). The basic gain of vacuum tubes and FETs is expressed as transconductance. It is represented with the symbol gm.

How do you find the transconductance of a transistor?

Transconductance shows how sensitive collected current IC is with respect to the base emitter voltage VBE. gm=ICVT, where IC is the DC collector current at the Q-point and VT is the thermal voltage. This is the transconductance for a bipolar junction transistor (BJT).

What is transconductance of BJT?

In reference to a BJT/FET , transconductance is the ratio of output drain current with respect to change in the input gate voltage. The above diagram shows a simple transconductance amplifier. The ratio is represented by the symbol gm.

What is transconductance in an amplifier?

The operational transconductance amplifier (OTA) is an amplifier whose differential input voltage produces an output current. Thus, it is a voltage controlled current source (VCCS). There is usually an additional input for a current to control the amplifier’s transconductance.

Is BJT is a transconductance amplifier?

As a transconductance amplifier, the small signal input voltage, vbe for a BJT or vgs for a FET, times the device transconductance g m , modulates the amount of current flowing through the transistor, ic or id.

What is transconductance and why is it important?

Transconductance is an expression of the performance of a bipolar transistor or field-effect transistor (FET). In general, the larger the transconductance figure for a device, the greater the gain(amplification) it is capable of delivering, when all other factors are held constant.

Why is it called transconductance?

The ‘trans’ bit is short for ‘transfer’, and the transfer referred to is from input to output. Transconductance by itself isn’t related to inputs or outputs. Transconductance is simply 1/resistance as you write.

What is the transition frequency of a transistor?

Transition frequency may refer to: A measure of the high-frequency operating characteristics of a transistor, usually symbolized as fT. A characteristic of spectral lines. The frequency at which changes in the hyperfine structure of atoms occur.

Is transistor a rectifier?

Transistor as a Rectifier. Transistor is a three terminal semiconductor device normally used as an amplifier or as a switch. Here the alternating current (a.c) rectifying property of the transistor is considered. The ordinary silicon diode exhibits a voltage drop of ~0.6V across its terminals.

Is a transistor a semiconductor device?

A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power. It is composed of semiconductor material usually with at least three terminals for connection to an external circuit.

Why is a transistor called a transistor?

Transistor is a device which offers resistance when connected across the circuit. Hence it is called a resistor. Also that it amplifies the input signal and transfers it to the output part of the amplifier. Hence called by the name of trans resistor and thus transistor.