Semiconductor Electronics: Materials, Device and Simple Circuits Class 12 Notes Physics Chapter 14

Chapter at a Glance

1. According to band theory, the substance is a semi conductor if forbidden gap is order of 1 eV.

12. Switch: Transistor in cut off or saturation state.
13. Under suitable reverse bias break down occurs and voltage gets stablized at Zener voltage

18. AND, OR and NOT logic operations follow closure property, i.e., input as well as output are in either of the binary states.
19. NAND and NOR gates are universial gates
20. If the logic gate is changed from positive to negative or vice-versa AND changes into OR, OR changes into AND, NAND changes into NOR and NOR charges into NAND.

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