BJT vs FET Comparison and SCR & Zener Diode Characteristics
Unit 4
1.8 Compare BJT and FET?
Comparison Between BJT and FET
| BJT (Bipolar Junction Transistor) | FET (Field Effect Transistor) |
|---|---|
| Current controlled (base current controls collector current) | Voltage controlled (gate voltage controls drain current) |
| Both electrons and holes contribute to current flow | Only majority carriers (electrons in N-channel, holes in P-channel) |
| Moderate input impedance | High input impedance (due to reverse bias on gate) |
| Relatively high power consumption | Relatively low power consumption |
| High |
PN Junction Diode V-I Characteristics, Resistance & Switching Times
V-I Characteristics of a PN Junction Diode
1. V-I Characteristics of a PN Junction Diode?
The voltage-current (V-I) characteristics of a PN junction diode describe the relationship between the voltage applied across the diode and the resulting current that flows through it. This relationship is highly nonlinear and is typically divided into three regions: forward bias, reverse bias, and breakdown.
Forward Bias Region
Forward Bias Region: In the forward bias region, the positive terminal of the voltage
Read MoreBJT Common-Base (CB) Configuration Characteristics and Switching Times
Unit 3: BJT Common-Base Configuration
2. Draw the Circuit Diagram and Explain the Characteristics of BJT in CB
Characteristics of BJT in CB Configuration
The V-I characteristics of a BJT in the common-base (CB) configuration describe the relationship between the voltages and currents at the emitter and collector for various base currents. These characteristics are divided into input and output characteristics.
1. Input Characteristics (Emitter–Base V‑I)
These characteristics show the relationship
Read MoreField-Effect Transistors and Op-Amp Principles
Construction and Working of an n-channel JFET
Construction
An n-channel JFET consists of a small bar of extrinsic n-type semiconductor material. Two ohmic contacts are made at its ends, serving as the drain (D) and source (S) terminals. Heavily doped p-type electrodes form reverse-biased p-n junctions on both sides of the n-type bar, creating the gate (G) terminals (usually connected together). The thin region between these two p-gates is the n-channel, through which current flows.
Working
The gate-
Read MoreMicrocontrollers, Robotics, and Circuit Analysis
Microcontrollers and Robotics Fundamentals
Microcontrollers vs. Personal Computers
147: A microcontroller is a programmable integrated circuit on a single chip that incorporates all the basic functions of a computer, including the processing unit, memory, and input/output peripherals. It essentially functions as a computer with limited capabilities on a single chip. It differs from a Personal Computer (PC) in several key ways:
- Microcontrollers are cheaper and have lower power consumption (allowing
BJT Configurations: Characteristics of CB, CE, and CC Modes
Common Base (CB) Transistor Configuration
Circuit Description
In the Common Base (CB) configuration, the input is applied between the Emitter (E) and Base (B), and the output is taken between the Collector (C) and Base (B). The Base terminal is common to both the input and output. For active region operation, the emitter-base junction is forward-biased, and the collector-base junction is reverse-biased.
Input Characteristics
- Definition: A graph of Emitter Current (IE) versus Emitter-Base Voltage (VEB)