Stabilization Of Operating Point | Electrical Engineering
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This document discusses the stabilization of operating point in BJTs. It defines the load line and operating point, and explains that the operating point depends on factors like current gain, temperature, and supply voltage variations. An increase in current gain or temperature will shift the operating point towards saturation. It also describes different bias circuit types - fixed bias, collector base bias, fixed bias with emitter resistance, and voltage divider bias - and provides their basic equations.
Stabilization Of Operating Point | Electrical Engineering
- 1. Stabilization of operating point
- 2. BJT load line It is plotted from DC equivalent circuit In this collector current at is determined at saturation and collector emitter voltage at cut-off.
- 3. Operating point or Q-point It is the point at which transistor is biased It is determined on DC load line
- 4. Operating point stability It depends on various factor Variation of current gain Variation of temperature Variation of reverse saturation current Variation of base emitter voltage Improper regulation of supply voltage
- 5. Effect of variation of current gain For higher current gain operating point shifts towards saturation.
- 6. Effect of variation of temperature For higher temperature, keeping base current constant operating point shifts towards saturation.
- 7. Types of bias circuit Fixed bias Collector base bias Fixed bias with emitter resistance Voltage divider bias
- 8. Fixed bias Base current is given by Collector current is DC equivalent circuit
- 9. Collector base bias This arrangement is more sensitive to temperature variation. Base current is DC equivalent circuit
- 10. Fixed bias with emitter resistance It has additional resistive element on emitter terminal. It improves stability. Base current is DC equivalent circuit
- 11. Voltage divider bias Potential divider circuit is implemented. Voltage across resistance R2 is taken as base voltage. Base voltage is DC equivalent circuit is
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Editor's Notes
- #4: min