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Questions and Answers
What is the main difference between a phototransistor and a regular BJT?
What is the main difference between a phototransistor and a regular BJT?
- The collector current in a phototransistor is produced by light, while in a regular BJT it is produced by a voltage source.
- The base current in a phototransistor is produced and controlled by light, while in a regular BJT it is controlled by a voltage source. (correct)
- The phototransistor has a higher dark current than a regular BJT.
- The phototransistor has a lower base-emitter leakage current than a regular BJT.
What is the function of the lens opening in the phototransistor package?
What is the function of the lens opening in the phototransistor package?
- To increase the collector current in the phototransistor.
- To control the base current in the phototransistor.
- To expose the C-B pn junction to incident light. (correct)
- To reduce the dark current in the phototransistor.
What is dark current in a phototransistor?
What is dark current in a phototransistor?
- The current produced when light strikes the photosensitive semiconductor base region.
- The current that increases with light intensity.
- The collector current in the presence of incident light.
- The thermally generated C-to-E leakage current in the absence of incident light. (correct)
What happens to the base current in the presence of incident light in a phototransistor?
What happens to the base current in the presence of incident light in a phototransistor?
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What does the collector current in a phototransistor do in response to the base current produced by light?
What does the collector current in a phototransistor do in response to the base current produced by light?
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