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Electronic Devices & CircuitsBJT Amplifiers

A transistor amplifier has voltage gain Av = -50. The negative sign indicates?

  • APower loss only
  • BA 180-degree phase inversion between input and output voltage
  • CThe transistor is necessarily in cutoff
  • DThe output frequency is negative
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Correct Answer: B. A 180-degree phase inversion between input and output voltage
Explanation: A negative voltage gain indicates that the output voltage is inverted relative to the input, corresponding to approximately 180 degrees phase difference.
Reference: Standard analog electronics: amplifier phase inversion
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