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In a photo-diode when light is incident, the fractional increase in the majority carriers is much less than the fractional increase in the minority carriers. Consequently, the fractional change due to the photo-effects on the minority carrier dominated reverse bias current is more easily measurable than the fractional change due to the photo-effects on the majority carrier dominated forward bias current. Hence, photo-diodes are preferred to be used in the reverse bias condition to easily observe the variation of current with intensity.
What else can I help you with?
How is a non-conducting diode biased?
A nonconducting diode is biased in the reversed direction (reverse polarization).
A varactor diode is operated under reverse biased conditionwhy?
because reverse biased current is constant upto avalanche breakdown.
When the light decreases the reverse minority-carrier current in a photodiode?
When light decreases, the generation of electron-hole pairs in a photodiode diminishes, leading to a reduction in the minority-carrier concentration. This results in a decrease in the reverse minority-carrier current, as there are fewer charge carriers available to contribute to the current flow. Consequently, the photodiode's response weakens, indicating less sensitivity to light. In essence, decreased light leads to lower photocurrent due to reduced carrier generation.
Why is the input impedance of a jfet so high?
If you mean JFET, it is because the gate junction is reverse biased.
What are the vi characteristics of ideal diodes?
Zero current flow when reverse biased, zero voltage drop when forward biased.
When both junction of npn diode reverse biased the the diode in what state?
reverse biased
What is the differences between light emitting diode and a photodiode?
A light-emitting diode (LED) emits light when an electric current passes through it. A photodiode, on the other hand, generates an electric current when exposed to light. In summary, an LED produces light, while a photodiode detects light.
How is a non-conducting diode biased?
A nonconducting diode is biased in the reversed direction (reverse polarization).
What is the function of photodiode?
A photodiode is a semiconductor device that converts light into electrical current. It is commonly used in optoelectronic devices such as light sensors, solar cells, and barcode scanners. The function of a photodiode is to detect and measure light intensity by generating a current proportional to the incident light.
A varactor diode is operated under reverse biased conditionwhy?
because reverse biased current is constant upto avalanche breakdown.
Why do we get current in reverse bias?
because semiconductor diodes are not perfect insulators when reverse biased. if you want a diode that is a perfect insulator when reverse biased, use a vacuum tube diode.
Why silicon controlled rectifier doesn't work in reverse biased condition?
Because when reverse biased it behaves like any other rectifier/diode.
Why collector base junction is always reverse biased for normal operation of transistors?
collector junction is reverse biased so as to remove the charge carriers away from its junction with the base.
Why is the input impedance of a jfet so high?
If you mean JFET, it is because the gate junction is reverse biased.
When the light decreases the reverse minority-carrier current in a photodiode?
When light decreases, the generation of electron-hole pairs in a photodiode diminishes, leading to a reduction in the minority-carrier concentration. This results in a decrease in the reverse minority-carrier current, as there are fewer charge carriers available to contribute to the current flow. Consequently, the photodiode's response weakens, indicating less sensitivity to light. In essence, decreased light leads to lower photocurrent due to reduced carrier generation.
What will happen if a diode is connected to capacitor?
the diode when forward biased will conduct and during reverse biased condition(generally doring reverse biased condition ckt is open mens no current flows;when register is connected)current flows but during reverse biased condition 1--for sometimes initially current flows due to discharging of capacitor. 2--then ckt will be having no current
Why semiconductor photo-diodes are reverse biased?
Because if you forward-biased them they would always conduct, even in total darkness.
