Which of the following is the main application of point contact diodes?
Which of the following is the main application of point contact diodes?
The point contact diode is used as a video detector in television receiver. It is used as an AM (amplitude modulation) detector in radio receiver. It is used in high frequency circuits of the order of 10 GHZ or more. It is used in microwave frequency mixer circuits.
What is the cut-in voltages for the diodes used?
approximately 0.7 volts
The forward voltage at which the silicon diode starts allowing large electric current is called cut-in voltage. The cut-in voltage for silicon diode is approximately 0.7 volts.
What is point contact diode?
• Construction: It is basically a piece of semiconductor material and fine wire making contact with semiconductor part. Earlier germanium was used as semiconductor material in point contact diode design. Now-a-days P-type semiconductor is used as anode and fine tungsten wire as cathode.
What is the physical reason for the cut in voltage?
The cut in voltage is the co-sequence of the linear model of the I-V curve of the diode. It is so that the I-V curve is approximated by two pieces of a straight lines, one is horizontal and the other is inclined the point between them is cosidered as the point of onset conduction and called the cut in voltage.
What is the cut in or knee voltage of the tested diode?
Knee voltage: The forward voltage at which the flow of the current during the PN Junction of the diode begins increasing very quickly is commonly known as knee voltage. This voltage is also known as cut-in voltage.
What is cut in voltage?
Cut in voltage (Knee voltage): The voltage at which the forward diode current starts increasing rapidly is known as the cut in voltage of a diode. The cut in voltage is very close to the barrier potential. Cut in voltage is also called as knee voltage.
What are the applications of diode and transistors?
In analog, digital, and mixed-signal circuits, diodes and transistors both provide different types of switching functions, while transistors also supply signal amplification when needed. Diodes and transistors of various types are used at RF and microwave frequencies, depending on required function and frequency range.
Which diode is used as voltage regulator?
Zener diodes
Since this breakdown voltage is also called Zener voltage, voltage regulator diodes are also called Zener diodes. This voltage may be used as a constant voltage power supply or a reference voltage for electronic circuits. (Note: Generally, the Zener phenomenon is observed when the voltage is 6 V or less.
What is the cutin voltage of a diode?
This is called the knee voltage or cut-in voltage and is equal to the barrier potential of the p-n junction. Originally Answered: What is the cutin voltage of a diode? For silicon diode it is 0.7V For germanium it is 0.3 V. Do this instead of buying expensive solar panels (it’s genius).
What are the applications of a point contact diode?
The point contact diode is used in pulse circuits. It is used as a video detector in television receiver. It is used in microwave frequency mixer circuits.
What happens when forward bias is applied to point contact diode?
When forward bias is applied to point contact diode the current produced in the device is passed through the cat whisker. Due to this, the tungsten wire gets heated. Due to this heating, the wire undergoes deformation. Thus, a small gap is deliberately left for the expansion of wire under the large current.
What is the cut-off voltage?
The cut-off voltage is the voltage at which a battery is considered fully discharged, beyond which further discharge could cause harm. Some electronic devices, such as cell phones, will automatically shut down when the cut-off voltage has been reached. Why the cut in voltages of silicon and germanium different?