How do you find the transconductance of a circuit?

For vacuum tubes, transconductance is defined as the change in the plate (anode) current divided by the corresponding change in the grid/cathode voltage, with a constant plate(anode) to cathode voltage.

What is the formula of transconductance?

It is used in bipolar junction transistors in order to measure its sensitivity. 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.

What transconductance means?

Definition of transconductance : the ratio of a change in the current through one electrode in an electron tube to the change of voltage responsible for it in another electrode with the potentials of the remaining elements being constant — compare mutual conductance.

What is the transconductance of a differential amplifier?

The circuit is called a differential transconductance amplifier. An ordinary con- ductance turns a voltage difference across two terminals into a current through the same two terminals. A transconductance turns a voltage difference somewhere into a current somewhere else.

What is transconductance measured in?

siemens
Glossary Term: Transconductance The term derives from “transfer conductance” and is measured in siemens (S), where 1 siemens = 1 ampere per volt. It was formerly measured as “mho” (ohm spelled backwards).

What is GM in analog electronics?

Gm is a measure of the conductance of a component. It is measured in a unit called siemens(S). The formula for calculating gm is: VT is the thermal voltage of a transistor; at room temperature, the value is approximately 25mV. The current, IEQ, is obtained by doing DC analysis of the transistor.

What is ideal transconductance 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).

What is transconductance of a transistor?

Transconductance is an expression of the performance of a bipolar transistor or field-effect transistor (FET). For an FET, transconductance is the ratio of the change in drain current to the change in gate voltage over a defined, arbitrarily small interval on the drain-current-versus-gate-voltage curve.

How is GM Value calculated?

In Mathematics, the Geometric Mean (GM) is the average value or mean which signifies the central tendency of the set of numbers by finding the product of their values. Basically, we multiply the numbers altogether and take the nth root of the multiplied numbers, where n is the total number of data values.

How does a transconductance amplifier work?

A transconductance amplifier outputs a current proportional to its input voltage. the ratio of the tubes plate current to its grid voltage.

What is the unit of transconductance?

Transconductance is a measure of the change in plate current to a change in grid voltage, with plate voltage held constant. The unit for conductance is the mho (siemens), pronounced “moe.” Transconductance is normally expressed in either micromhos or millimhos.

What is the transconductance of a small signal vacuum tube?

Typical values of gm for a small-signal vacuum tube are 1 to 10 millisiemens. Similarly, in field effect transistors, transconductance is the change in the drain/source current divided by the change in the gate/drain voltage with a constant drain/source voltage.

What is the transconductance of a field effect transistor?

Similarly, in field effect transistors, transconductance is the change in the drain/source current divided by the change in the gate/drain voltage with a constant drain/source voltage. Typical values of gm for a small-signal field effect transistor are also 1 to 10 millisiemens.