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Electronic Devices & CircuitsBJT Biasing

Emitter resistance in a BJT bias circuit improves thermal stability mainly by providing?

  • ANegative feedback against increases in emitter and collector current
  • BPositive feedback that increases current indefinitely
  • COptical isolation
  • DA higher transistor breakdown voltage directly
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Correct Answer: A. Negative feedback against increases in emitter and collector current
Explanation: If current rises, the emitter voltage rises across RE, reducing effective base-emitter drive and opposing the current increase.
Reference: Standard transistor electronics: emitter degeneration and bias stability
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