Question
What is the approximate forward threshold voltage of a germanium diode?
Answer Options
- A) 0.1 volt
- B) 0.3 volts
- C) 0.7 volts
- D) 1.0 volts
Correct Answer: B
Explanation
The forward threshold voltage, or cut-in voltage, is the minimum forward-bias voltage that must be applied across a semiconductor diode before it begins to conduct significant current. This value is determined by the material used to create the diode’s junction.
Germanium diodes are characterized by a very low threshold voltage, typically around 0.3 volts. This low threshold makes them useful in low-voltage applications, such as sensitive RF detectors or signal mixers, where only a small signal voltage is available for rectification.
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