RELATION BETWEEN ALPHA AND BETA IN TRANSISTOR
Alpha and Beta are two very important factors in a transistor. However, there is no direct relation between Alpha and Beta. These two characteristics of a transistor are related by the following formula:
What is Alpha and Beta
Alpha and beta are two important parameters that are used to describe the operation of a transistor. Alpha is the ratio of collector current to base current when the transistor is in the active region (i.e., when it can amplify). Beta is the ratio of collector current to base current when the transistor is in saturation region (i.e., when there’s no amplification).
Relation between Alpha and Beta in Transistor
Alpha and Beta are parameters of a transistor. Alpha is the current that flows through the collector-base junction, while Beta is the current that flows through the base-emitter junction. The ratio of Alpha to Beta is called “alpha ratio”, which can be expressed as:
- Alpha Ratio = alpha / beta
- When alpha = 1 and beta = 1, then alpha ratio = 0 (zero). This means there will be no conduction at all; therefore, no power gain will occur in this case!
- Alpha is the ratio of collector current to base current.
- Beta is the ratio of collector current to emitter current.
- Alpha and beta are inversely proportional to each other, meaning that if one increases, then the other decreases (and vice versa).
We have seen the relation between alpha and beta in transistor. Alpha is the current gain and beta is the voltage gain. The ratio of these two parameters determines the current or voltage rating of a transistor.