Podcast
Play an AI-generated podcast conversation about this lesson
Questions and Answers
What is the primary function of photodiodes?
What is the primary function of photodiodes?
- To detect photons and sense light (correct)
- To amplify light signals
- To convert light into electrical energy
- To filter out unwanted light wavelengths
What happens when photons excite carriers in a reverse-biased pn junction?
What happens when photons excite carriers in a reverse-biased pn junction?
- A very small current proportional to the light intensity flows (correct)
- A large current flows through the photodiode
- The photodiode stops functioning
- The photodiode becomes forward-biased
How does the sensitivity of photodiodes depend on light?
How does the sensitivity of photodiodes depend on light?
- It is independent of light characteristics
- It depends on the frequency of light
- It depends on the intensity of light
- It depends on the wavelength of light (correct)
What is the relation between the current through a phototransistor and the incident light intensity?
What is the relation between the current through a phototransistor and the incident light intensity?
Signup and view all the answers
What is the process by which photodetectors create an electron-hole pair?
What is the process by which photodetectors create an electron-hole pair?
Signup and view all the answers
What is the role of bias voltage in a photodiode?
What is the role of bias voltage in a photodiode?
Signup and view all the answers
What is the equation that governs the operation of a photodiode?
What is the equation that governs the operation of a photodiode?
Signup and view all the answers
What is the term for the current that flows through a photodiode when it is not sensing light?
What is the term for the current that flows through a photodiode when it is not sensing light?
Signup and view all the answers
What is the relationship between the photocurrent and the number of electron-hole pairs created?
What is the relationship between the photocurrent and the number of electron-hole pairs created?
Signup and view all the answers
What is the characteristic of phototransistors that distinguish them from photodiodes?
What is the characteristic of phototransistors that distinguish them from photodiodes?
Signup and view all the answers
