Operating Frequency limitation for a Bipolar semi-conductor device is due to

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  1. Junction Parasitic
  2. Electron Mobility
  3. both (1) and (2)
  4. None of above

Answer (Detailed Solution Below)

Option 3 : both (1) and (2)
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Detailed Solution

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The correct answer is: 3) both (1) and (2)

Explanation:

  • Junction Parasitics (like capacitance and resistance at the PN junctions) slow down the switching speed of the device, especially at high frequencies.

  • Electron Mobility affects how quickly charge carriers can move through the semiconductor. Lower mobility results in slower device response, thus limiting high-frequency operation.

Both factors contribute to the frequency limitation of bipolar semiconductor devices.

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