Advertisements
Advertisements
प्रश्न
Answer the following question.
Why photodiodes are required to operate in reverse bias? Explain.
Advertisements
उत्तर
The photodiode is reverse biased for operating in the photoconductive mode. As the photodiode is in reverse bias, the width of the depletion layer increases. This reduces the junction capacitance and thereby the response time. In effect, the reverse bias causes faster response times for the photodiode. The photocurrent is linearly proportional to the illuminance.
संबंधित प्रश्न
The graph shown in the figure represents a plot of current versus voltage for a given semiconductor. Identify the region, if any, over which the semiconductor has a negative resistance.
Diffusion in a p-n junction is due to ______.
What are the applications of p - n Junction diode?
A – pn junction has a depletion layer of thickness .of the order of
The nature of binding for a crystal with alternate and evenly spaced positive and negatively ions is
Figure shows the transfer characteristics of a base biased CE transistor. Which of the following statements are true?
At Vi = 0.4 V, transistor is in active state.
At Vi = 1 V, it can be used as an amplifier.
At Vi = 0.5 V, it can be used as a switch turned off.
At Vi = 2.5 V, it can be used as a switch turned on.
In the depletion region of a diode ______.
- there are no mobile charges.
- equal number of holes and electrons exist, making the region neutral.
- recombination of holes and electrons has taken place.
- immobile charged ions exist.
Explain the formation of the barrier potential in a p-n junction.
Draw the circuit arrangement for studying V-I characteristics of a p-n junction diode in (i) forward biasing and (ii) reverse biasing. Draw the typical V-I characteristics of a silicon diode.
An ideal PN junction diode offers ______.
