Electronics Flashcards
What is knee voltage?
Voltage at which majority charge carriers cross the junction and current flows in forward biasing.
Potential barrier or knee voltage of Silicon and Germanium?
Silicon = 0.7 Germanium = 0.3
Maximum current limit of junction is decided by?
Power ratio of junction
What is Zener effect?
When reverse voltage is increases due to available energy, covalent bonds break and large number of electrons are released. And current is suddenly increased.
What is avalanche effect?
When reverse voltage is increased further, charge carriers attain high velocity, knock down electrons, break more covalent bonds, and current increases damaging the PN junction.
What is reverse current called?
Revere current
leakage current
saturation current
Operational region?
When diode behaves as ohmic for a short period of time
Breakdown voltage?
The maximum reverse voltage at which diode burns out.
Transformer coupling in rectification?
- To step up or down source voltage as needed
2. To keep ac source electrically isolated from rectifier to avoid any shocks
Peak inverse voltage? (PIV)
Maximum voltage that the rectifying diodes have to withstand when it is reverse biased.
PIV = V (max)
For half wave rectifier.
Maximum voltage that appears across diode.
Center tap rectifier?
A type of full wave rectifier having transformer with center tapped secondary and two diodes with alternate switching mode.
Minimum number of diodes required for full wave rectification?
2
