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Presentation On Logic Gates

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Published in: Electrical | Electronics
2,276 Views

This ppt describes the working and application of logic gates at logic level and transistor level

Akhilesh M / Pune

3 years of teaching experience

Qualification: M.Tech (Aissms coe - 2016)

Teaches: Algebra, Economics, Geography, Hindi, Mathematics, Physics, AFCAT, CDS/OTA Exam, Defence Exams, NDA, SSB Exam, UGC Exams, Electronics, Electronics And Communication, Instrumentation, Mechanics, IELTS, Spoken English, TOEFL, Aerobics, Fitness Centre, Meditation, Physical Development, Power Yoga, Yoga, English, German, Marathi, Sanskrit

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  1. Transistors
  2. Transistor "A transistor is a semiconductor device used to amplify or switch electronic signals and electrical or power." COLLECTOR 3 2 12 3 Pin Diagram EMITTER npn transistor Symbol of npn transistor 12 3 Pin Diagram pnp transistor 3 2 1 Symbol of pnp transistor "Transistor is a three leg insect type component, which is placed singly in some devices but in computers it is packed inside in millions of numbers in small microchips" Silicon and germanium are used as semiconductor material. Semiconductors are doped to obtain N and P-type regions. Si is doped with Ar, P — extra charge carriers(e-) = N type region. Si doped with B, Ga — less charge carriers(holes) = P type region. Emitter n-type Emitter Region Emitter-Base junction(EB) p-type Base region BASE n-type Collector Collector Collector-Base Junction(CB)
  3. DESIGN OF A TRANSISTOR Transistors basically consists of three legs: 0 Base: It gives base to the transistor electrodes. 0 Emitter: Charge carriers emitted by this. 0 Collector: Charge carriers collected by this. c
  4. TYPES OF TRANSISTORS Bipolar Junction Transistor (BJT) PNP Transistor NPN Transistor
  5. BIPOLAR JUNCTION TRANSISTOR Three terminals — base , emitter , collector Small amount of current can amplify in large amount o It also called current controlled device o It has highest amplification than all transistors 100.1 b
  6. NPN TRANSISTOR Base- P-type, collector & Emitter — N —type Need to apply voltage of 0.7 BE o Forward biased condition Reverse biased condition The collector is more positive Collector Circuit Symbol Base
  7. PNP TRANSISTOR Base- n-type , collector & Emitter ID-type P BE Collector Base Circuit Symbol Væ VCE o It is normally in ON state Reversed biased condition Forward biased condition The emitter is more positive
  8. +0.7 VEB, V ic, mA Saturation region 40.5 0 Active region -5 Cutoff region • = 5mA 4 3 2 1 -10 VCB, V CEO Operation regions of a transistor
  9. 50kQ Ikfi ß=50 Transistor as a switch
  10. +Vcc out in Transistor as an amplifier

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