Semiconductors Class 12 ka last chapter hai — p-n junction, diodes aur logic gates. Modern syllabus ka scoring topic. Yahan aapko is chapter ke sabse important formulas aur quick revision points free milte hain — NCERT/CBSE syllabus ke hisaab se, boards aur JEE/NEET dono ke liye.
Important Formulas & Concepts — Semiconductor Electronics
- Intrinsic: nₑ = nₕ = nᵢ; n-type: nₑ >> nₕ (pentavalent doping)
- p-type: nₕ >> nₑ (trivalent doping)
- nₑnₕ = nᵢ²
- Forward bias: barrier ghatta hai, current flow; reverse: barrier badhta hai
- Rectifier: half-wave (1 diode), full-wave (2/bridge 4 diodes)
- Zener diode: voltage regulator (reverse breakdown)
- Logic gates: AND (A·B), OR (A+B), NOT (Ā), NAND, NOR
- NAND aur NOR universal gates hain
Quick Revision Points
- Energy gap: conductor ~0, semiconductor <3 eV, insulator >3 eV
- Si (1.1 eV), Ge (0.7 eV)
- Temperature badhne par semiconductor ki conductivity badhti hai (metals se ulta)
- Full-wave rectifier ki ripple frequency = 2 × input
- Truth tables banake gates ke combined outputs nikalo
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FAQ
Logic gates ke questions kaise aate hain?
Combined circuits ka output nikalna — truth table method PDF mein steps ke saath hai.
Rectifier diagram zaroori hai?
Haan — full-wave rectifier ka labelled diagram + working boards mein regular hai.
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