The varactor is a pn junction that acts as what type of  electronic device?

1 Answer

Answer :

Variable capacitor.

Related questions

Description : What type of bias opposes the PN junction barrier?

Last Answer : Forward.

Last Answer : A pn junction acts as a Unidirectional switch.

Description : When a PN junction is forward biased, what happens to the depletion region?

Last Answer : The depletion region decreases.

Description : What is the main difference in construction between normal PN junction diodes and tunnel diodes?

Last Answer : The amount of doping.

Description : Which breakdown theory explains the action that takes place in a heavily doped PN-junction with a reverse bias of less than 5 volts?

Last Answer : Zener effect.

Description : The action of a PN-junction during breakdown can be explained by what two theories?

Last Answer : Zener effect and avalanche effect.

Description : In a reverse biased PN-junction, which current carriers cause leakage current?

Last Answer : The minority carriers

Description : In order to reverse bias in a PN junction, what terminal of a battery is connected to the P material?

Last Answer : Negative.

Description : What is the name of the area in a PN junction that has a shortage of electrons and holes?

Last Answer : Depletion region

Description : What is the purpose of a PN junction diode?

Last Answer : To convert alternating current into direct current

Description : What is the primary advantage of bulk-effect devices over normal pn-junction semiconductors?

Last Answer : Larger microwave power outputs.

Description : When the reverse bias on a varactor is increased, what happens to the effective capacitance?

Last Answer : Capacitance decreases.

Description : The varactor displays what useful electrical property?

Last Answer : Variable capacitance.

Description : What characteristic of a varactor is used in an fm modulator?

Last Answer : Capacitance.

Last Answer : The p-type substrates in a conventional pn-junction isolated integrated circuit should be connected to: The most negative potential available in the circuit.

Description : Which junction acts as the detector in a common-base detector?

Last Answer : Emitter-base junction.

Description : The unidirectional property of a pn-junction is useful for its use as which thing? -General Knowledge

Last Answer : The answer is 'Rectifier'

Description : The unidirectional property of a pn-junction is useful for its use as which thing? -General Knowledge

Last Answer : answer:

Description : The unidirectional property of a pn-junction is useful for its use as which thing? -General Knowledge

Last Answer : answer:

Description : What is PN Junction ? What is PN Junction ?

Last Answer : When a P-type semiconductor makes a suitable connection with an N-type semiconductor in a special way, the connection surface is called PN junction.

Description : An ohmmeter used to test for front-to-back resistance of a PN junction diode should produce roughly what ratio? A. 100:01:00 B. 500:01:00 C. 1000:01:00 D. 5000:01:00

Last Answer : Answer: A

Description : The unidirectional property of a pn-junction is useful for its use as which thing

Last Answer : Rectifier

Description : Write some applications of PN junction diode

Last Answer : 1. Rectifier circuit ii. clipping and clamping iii voltage multiplier iv AM detection v. Feedback diodes vi Freewheeling diode

Description : What is depletion region in PN junction?

Last Answer : The region around the junction from which the mobile charge carriers ( electrons and holes) are depleted is called as depletion region.since this region has immobile ions, which are electrically charged , the depletion region is also known as space charge region.

Description : A pn-junction diode emits light by spontaneous emission ∙ A. LED ∙ B. APD ∙ C. PIN

Last Answer : A. LED

Description : If PN junction is forward biased its resistance is (a) Zero (b) Infinity (c) A few ohm (d) A few kilo ohms

Last Answer : c) A few ohm

Description : State any Four applications of PN junction diode.

Last Answer : 1. Rectifiers in power supplies, 2. Detectors in RF, 3 .Clippers, 4. In clamping networks used as DC Restorers, 5. As switches in digital logic circuits.

Description : Describe the working of PN junction diode with neat sketch under forward biased condition.

Last Answer : If the p-region (anode) is connected to the positive terminal of the external DC source and nside (cathode) is connected to the negative terminal of the DC source then the biasing ... The large number of majority carriers crossing the junction constitutes a current called as the forward current.

Description : Describe avalanche and zener breakdown of PN junction with neat graph.

Last Answer : Avalanche Breakdown It is observed in diodes having Vz> 8V. is called Avalanche Breakdown It occurs due to accelerating minority carriers. It shows gradual change. Breakdown voltage ... field. Breakdown is very sharp. Breakdown voltage decreases with increase in temperature 

Description : Define Depletion region and Barrier voltage of PN junction.

Last Answer : 1. Depletion region : The region consisting of immobile positive charge at n-side and immobile negative charge at p-side near the junction acts like a barrier and prevents the further flow of ... charge formed at the p-n junction is called barrier voltage, barrier potential or junction barrier.

Description : Plot and explain I -V characteristics of a PN junction diode. 

Last Answer : V-I characteristics of PN junction diode: Explanation:  Forward Bias:  If the external voltage applied on the silicon diode is less than 0.7 volts, the silicon diode ... reverse breakdown voltage.  * Diode breakdown occurs by two mechanisms: Avalanche breakdown and Zener breakdown.

Description : Gold is often diffused into silicon PN junction devices to   (A) increase the recombination rate (B) reduce the recombination rate (C) make silicon a direct gap semiconductor (D) make silicon semi-metal

Last Answer : To  increase  the  combinational  rate  at  the  pn  junction

Description : A forward-biased PN-junction,  (A) results in increase in diffusion current  (B) results in increase in drift current  (C) results in decrease in drift current  (D) results in decrease in diffusion current

Last Answer : A forward-biased PN-junction,  results in increase in diffusion current 

Description : In a PN-junction with open circuit terminal (equilibrium), with P doping higher as compared to N doping (A) N-side depletion region is small as compared to p-side depletion region (B) N-side ... depletion region (C) N-side depletion region is same as p-side depletion region (D) Cannot say

Last Answer : In a PN-junction with open circuit terminal (equilibrium), with P doping higher as compared to N doping N-side depletion region is small as compared to p-side depletion region

Last Answer : A UJT has one PN Junction

Description : The leakage current in a pn junction is of the order of

Last Answer : The leakage current in a pn junction is of the order of µA.

Last Answer : With forward bias to a pn junction , the width of depletion layer Decreases.

Last Answer : The leakage current across a pn junction is due to Minority carriers.

Last Answer : A reverse bias pn junction has Almost no current.

Last Answer : In the depletion region of a pn junction, there is a shortage of Holes and electrons.

Last Answer : The battery connections required to forward bias a pn junction are +ve terminal to p and –ve terminal to n.

Description : The leakage current of PN junction is caused by?

Last Answer : The leakage current of PN junction is caused by heat energy.

Description : What type of PN diode is formed by using a fine metal wire and a section of N-type semiconductor material?

Last Answer : Point-contact.

Description : The UJT has how many PN junctions?

Last Answer : One.

Description : The total power in both series and parallel circuits is computed with the formula: PT = P1 + P2 + P3 +...Pn. Why can this formula be used for both series and parallel circuits?

Last Answer : In both cases all the power used in the circuit must come from the source.

Description : In electronic computers, vacuum tubes were replaced by transistors and transistors have been replaced by what device?

Last Answer : Integrated circuits.

Description : Draw the circuit diagram of varactor diode FM modulator and explain its working.

Last Answer : Varactor diode modulator is the direct method of FM generation wherein the carrier frequency is directly varied by the modulating signal. A varactor diode is a semiconductor diode whose ... the magnitude of frequency change is proportional to the amplitude of the modulating signal voltage.

Description : Draw the symbols of Schottkey-diode and Varactor diode.

Last Answer : Schottkey-diode

Description : The following is not an application of varactor diode:  a) Parametric amplifier b) Frequency tuner c) Voltage controlled oscillator d) Phase shifter

Last Answer : The following is not an application of varactor diode:  a) Parametric amplifier b) Frequency tuner c) Voltage controlled oscillator d) Phase shifter

Description : When two semiconductors of pand n-type are brought in contact, they form p-n junction which acts like a/an (1) Conductor (2) Oscillator (3) Rectifier (4) Amplifier

Last Answer : Rectifier