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What is the effect on a varactor when the bias voltage is increased?
Wiki User
∙ 11y ago
the varactor has spoil
Wiki User
∙ 11y ago
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What is verector diode in electronics?
I think you you are asking about varactor diode. varactor means variable capacitor. varactor diode is a p-n junction diode which provide a capacitance across it subjected to applied forward and reverse bias. means it provide variable capacitance which depends on the applied reverse voltage(mostly varactor diode works on reverse voltage).They are also known as varicap
Which diode is used in frequency tuning application?
The varactor diode is used in frequency tuning applications. Its effective capacitance is a function of the reverse bias voltage across it.
What is best describes how a varactor diode modulator creates FM?
Resonant frequency of a circuit is proportional to sq rt (L x C). A varactor diode, when suitably voltage biased, looks like a capacitor (C). Varying the bias varies the capacitor and thus the resonant frequency .
What is collector bypass capacitor?
A: It is not a bypass it is a negative feedback to effect the input voltage, Bias is when a DC voltage is applied to insure proper operation
What digital multimeter scale should be used when testing the signal from a Hall-effect switch?
You should use the scale that shows correctly your supply voltage. Most Hall-effect switches provide either a logical output or an open-collector output. If the output is logical, you can expect the value to be between 0 and your supply voltage. If the output is open-collector, you must bias the output to your supply voltage with a resistor; otherwise you will always read "0". If biased, the output will be between 0 and the voltage bias. If you are not certain of which type you have, try finding the datasheet on the Internet; otherwise, you can always bias the output to your supply voltage; if you properly choose the resistor, it should not adversely affect the behaviour of the logical-level output. I would suggest trying 1 kOhm with a 5 V supply; this gives a bias current of 5 mA, which most Hall-effect sensors should be able to cope with. There are other Hall-effect sensors that provide linear output, but this answer is about a Hall-effect switch.
Which diode used for voltage controlled capacitor?
Varactor didoe is used as voltage controlled capacitor.it is generally used in reverse bias condition.
What is verector diode in electronics?
I think you you are asking about varactor diode. varactor means variable capacitor. varactor diode is a p-n junction diode which provide a capacitance across it subjected to applied forward and reverse bias. means it provide variable capacitance which depends on the applied reverse voltage(mostly varactor diode works on reverse voltage).They are also known as varicap
Which diode is used in frequency tuning application?
The varactor diode is used in frequency tuning applications. Its effective capacitance is a function of the reverse bias voltage across it.
Explain the use of a varactor diode in a parallel resonance circuit?
Short answer: By using a varactor diode as the capacitance in a parallel resonant ckt, by changing the reverse bias voltage you change the value of capacitance which in turn changes the resonant frequency. This makes a tuneable resonant ckt.
What is difference between early effect and punch through in BJT?
When we apply reverse bias voltage to input and output sides of a BJT, then the width of the depletion layer at emitter-base and base-collection got increased. Due to which the effective base width got decreased. This phenomenon of reduction in the base width is called Early effect. And if we go on increasing the Reverse bias voltage then at a time instant the width of the base becomes zero and this effect is called punch through effect and that reverse bias voltage is called punch through voltage.
What is best describes how a varactor diode modulator creates FM?
Resonant frequency of a circuit is proportional to sq rt (L x C). A varactor diode, when suitably voltage biased, looks like a capacitor (C). Varying the bias varies the capacitor and thus the resonant frequency .
What is collector bypass capacitor?
A: It is not a bypass it is a negative feedback to effect the input voltage, Bias is when a DC voltage is applied to insure proper operation
What is the relationship between capacitance and reverse bias voltage in an abrupt junction varactor diode?
Generally, the depletion region thickness is proportional to thehttp://www.answers.com/topic/square-root of the applied voltage; and http://www.answers.com/topic/capacitanceis inversely proportional to the depletion region thickness. Thus, the capacitance is inversely proportional to the square root of applied voltage.
What is the DC bias voltage on a computer microphone?
DC bias voltage is the voltage that a microphone needs to receive in order to be able to power on. For computer microphones, the bias voltage power is normally around 2.2 Volts.
What are the characteristics of fixed bias?
It is a bias of a fixed voltage supplied by a separate low-power bias supply. Early radios used a 9 v tapped bias battery. In some amplifiers fixed bias can be dispensed with and the bias voltage is derived from one of the currents in the circuit.
Application of varactor diode?
It includes RF design , parametric amplification ,fm, harmonic generators, voltage controlled oscillators ,in radio ,tv,cellular and wireless receivers ,and in electronic tuning .. That's it. . .
Why it is named as self Bias of BJT?
The Self Bias of the BJT is also called the voltage divider bias. It is called thus because it can stabilize the collector current, the base emitter voltage and the amplification factor.
