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Questions tagged [varactor]

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1
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2answers
75 views

Can Zener or Schottky diodes be used as a substitute for varicap diodes in tuning a VCO?

In particular, this would be a fairly low frequency VCO with a frequency range of 10 Hz to 20 kHz. I'm thinking of the configuration with the T-junction that has 2 opposite facing, reversed biased ...
2
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1answer
56 views

How to choose RF choke in the biasing circuit of varactor-tuned resonant circuit

I am new to circuit and has a very basic question about how to set biasing circuit of varactor. I need to use varactor to tune the resonance behavior of Split ring resonator (SRR) structure when ...
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2answers
179 views

Direct FM generation using varactor diode

I am trying to generate a constant 1 MHz FM carrier wave. I have achieved it via LC parallel resonance circuit. Initially I let the switch B open and switch A closed, in order to charge the capacitor. ...
0
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2answers
323 views

Changing frequency of 555 timer with varicap or capacitor

I have created a 555 oscillator circuit where the output is set to have flashing LED light. Now I have a problem when I change the voltage of the potentiometer, the output frequency does not change. ...
0
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0answers
28 views

Capacitance vs Bias Voltage plot for Ferroelectric Varactor

I have created a passive circuit model with equation and passive elements of a ferroelectric varactor. I want to use it while designing in many RF applications like VCO and other applications. Now ...
0
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2answers
34 views

Capacitive voltage divider with varactor

Is it possible to create a capacitive voltage divider where one of the capacitors is a varactor whose capacitance can be manipulated/varied according to a signal? A varactor is a two port device; what ...
2
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2answers
71 views

Why are varactors unspecified at 0V?

Specsheets I'm reading tend to specify maximum capacitance at 1V instead of 0V reverse voltage bias. NXP BB series don't show anything below 1V in the tables and 0.5V in the graph. Skyworks SMV ...