Chapter 1 Introduction to Electronics

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Presentation transcript:

Chapter 1 Introduction to Electronics

PN Junction - Diode Current Flow

Bipolar Junction Transistor: BJT Emitter Base Collector

Field Effect Transistor: FET S = Source G = Gate D = Drain

Passive and Active Components Passive Components: Do no require/depend on power supply for its operation or the device which electrical characteristics does not depend on the power supply Examples: Resistor, capacitor, inductor Active components: Do require/depend on power supply for its operation or the device which electrical characteristics depend on the power supply Examples: Transistors such as BJT and FET

Electronic Circuits An electronic circuit generally contains both the passive and active components. Therefore a dc power supply is essential for the operation of its active components. An electronic processing or amplifier devices also need different power source than its DC operating power source called input signal. This input signal characteristics and power can be modified by the electronic circuit with the presence of its DC operating power supply. The processed input signal which is obtained from the electronic circuit is called output signal. Block diagram of an electronic circuit (Amplifier)

Analog and Digital Signals An electrical signal is a time varying voltage or current which bears the information by altering the characteristics of the voltage or current. In an analog signal the characteristics of the voltage or current which represents the information can be any value. Analog signal Digital signal must have discrete value, it is said quantization. In a digital signal the characteristics of the voltage or current which represents the information has only two values and sometimes it is called binary signal. Digital signal

Representation of Signal A sinusoidal voltage when it is superimposed on a DC voltage can be represented as Sinusoidal voltage superimposed on dc voltage VBEQ

DEFINITION vBE Total = (DC + AC) VBE DC Component vbe AC Component