11/7/2023 0 Comments Transistor biased in active regionReverse Active region: Like active mode, the current is proportional to the base current, but flows in reverse.The transistor appears as a near short circuit between the collector and emitter terminals. Saturation region: BJT operates in this zone in switching operations.Active region: BJT operates in this zone for amplifier circuits because the transistor can act as a fairly linear amplifier.Cutoff region: BJT operates in this zone in switching operations.BJTs can operate in different modes depending on the junction bias: The junctions between N and P regions are similar to the junctions in diodes and they can be forward-biased or reverse-biased as well. 2) while the NPN transistor has one P region between two N regions (Fig. The PNP transistor has one N region between two P regions (Fig. The semiconductor physics of BJTs will not be discussed here, but it is worth mentioning that a BJT is fabricated with three separately doped regions with two junctions. The Base is responsible for controlling the transistor while the Collector is the positive lead, and Emitter is the negative lead. A transistor is an active device with three terminals, and these three terminals are known as the Emitter (E), the Base (B), and the Collector (C) (Fig. BJTs are made of doped materials and can be configured as NPN and PNP. There are two main types of transistor: bipolar junction transistors (BJTs) and field effect transistors (FETs). Let’s take a closer look at how NPN and PNP transistors work. It’s easy to remember that NPN stands for Negative-Positive-Negative and PNP stands for Positive-Negative-Positive. This simple device can be used to create complex electronic circuits, and although there are other types of transistors, bipolar junction transistors are still widely used in digital circuits.īoth are used in various amplification and modulating circuits the most frequent among its applications is being fully ON and OFF, which is referred to as switch mode. The transistor is a three-terminal electronic device that can be used to control the flow of electric current, and was the first electronic device that could amplify or switch an electric current. It does not store any personal data.The transistor is probably the most important invention in electronic engineering and the basis for nearly all integrated circuits (ICs). The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. The cookie is used to store the user consent for the cookies in the category "Performance". This cookie is set by GDPR Cookie Consent plugin. The cookies is used to store the user consent for the cookies in the category "Necessary". The cookie is used to store the user consent for the cookies in the category "Other. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". The cookie is used to store the user consent for the cookies in the category "Analytics". These cookies ensure basic functionalities and security features of the website, anonymously. Necessary cookies are absolutely essential for the website to function properly. Field Effect Transistors FET and Types of FETs.Bipolar Junction Transistor BJT and types of BJTs.In NPN and PNP bipolar junction transistors (BJTs), connecting the base (B) to the collector (C) makes the PN-junction from the base (B) to the emitter (E) to be forward bias….Read more here> BJT Saturation Region READ ALSO THESE … Read more here> BJT Cutoff Region SATURATION REGION (FULLY ON)Ī transistor is said to be saturated (Fully ON) when it is biased in such a way that current passes from the Emitter (E) to the Collector (C). In this mode, the transistor is in OFF mode. In Bipolar Junction Transistor (BJT) cut off region or fully off region, the transistor is bias in such a way that both junctions are reverse so that no current will pass from the emitter (E) to the collector (C). That is cutoff (FULLY OFF) region and saturation (FULLY ON) region. Apart from the BJT active region, below are links to the other two operation region of bipolar junction transistor (BJT).
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