Bipolar Junction Transistors (BJT) | Electron Devices and Circuits
Subject and UNIT: Electron Devices and Circuits: Unit II: (a) Bipolar Junction Transistors (BJT)
Electron Devices and Circuits: Unit II: (a) Bipolar Junction Transistors (BJT) : University Questions with Answers (Long Answered Questions)
Bipolar Junction Transistors (BJT) | Electron Devices and Circuits
Subject and UNIT: Electron Devices and Circuits: Unit II: (a) Bipolar Junction Transistors (BJT)
Electron Devices and Circuits: Unit II: (a) Bipolar Junction Transistors (BJT) : Two Marks Questions with Answers
Bipolar Junction Transistors (BJT)
Subject and UNIT: Electron Devices and Circuits: Unit II: (a) Bipolar Junction Transistors (BJT)
• Transistors are widely used in digital logic circuits and switching applications. In these applications, the voltage levels periodically alternate between a "Low" and a "High" voltage, such as 0 V and + 5 V.
Bipolar Junction Transistors (BJT)
Subject and UNIT: Electron Devices and Circuits: Unit II: (a) Bipolar Junction Transistors (BJT)
• As mentioned earlier, compensation techniques use temperature sensitive devices such as diodes, transistors, thermistors, etc. to maintain operating point constant.
Bipolar Junction Transistors (BJT)
Subject and UNIT: Electron Devices and Circuits: Unit II: (a) Bipolar Junction Transistors (BJT)
• The different biasing circuits are : • Fixed bias circuit • Collector to base bias circuit • Voltage divider / self bias circuit • Emitter stabilized bias circuit • Miscellaneous bias circuit
Bipolar Junction Transistors (BJT)
Subject and UNIT: Electron Devices and Circuits: Unit II: (a) Bipolar Junction Transistors (BJT)
• We know that, the IC is a Unction of ICO, VBE and P Thus, it is convenient to introduce the three partial derivatives of IC with respect to these variables. These derivates are called stability factors S, S' and S" and are defined as follows :
Bipolar Junction Transistors (BJT)
Subject and UNIT: Electron Devices and Circuits: Unit II: (a) Bipolar Junction Transistors (BJT)
• Ideally, the Q point should be stable; it should not shift up and down on the dc load line. However, it is quite unstable.
Bipolar Junction Transistors
Subject and UNIT: Electron Devices and Circuits: Unit II: (a) Bipolar Junction Transistors (BJT)
• The transistor can be operated in three regions : cut-off, active and saturation by applying proper biasing conditions as shown in the Table 2.5.1.
Bipolar Junction Transistors (BJT)
Subject and UNIT: Electron Devices and Circuits: Unit II: (a) Bipolar Junction Transistors (BJT)
• The transistor can be connected in a circuit in the following three configurations. 1. Common base configuration. 2. Common emitter configuration. 3. Common collector configuration.
Bipolar Junction Transistors (BJT)
Subject and UNIT: Electron Devices and Circuits: Unit II: (a) Bipolar Junction Transistors (BJT)
• An unbiased transistor means a transistor with no external voltage (biasing) is applied. Obviously, there will be no current flowing from any of the transistor leads.
Bipolar Junction Transistors (BJT)
Subject and UNIT: Electron Devices and Circuits: Unit II: (a) Bipolar Junction Transistors (BJT)
• The middle region of each transistor type is called the base of the transistor. This region is very thin and lightly doped.
Subject and UNIT: Electron Devices and Circuits: Unit II: (a) Bipolar Junction Transistors (BJT)
• Transistor is a three terminal device : Base, emitter and collector, can be operated in three configurations common base, common emitter and common collector.