Questions tagged [varactor]
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28 questions
0 votes
2 answers
134 views
FM modulation circuit, if it were built without utilizing a varactor diode?
The aim is to construct an FM modulator circuit with a 10kHz carrier signal and a 1kHz audio signal. I experimented with different component values to enhance the circuit's performance. V2 represents ...
- 41
1 vote
1 answer
71 views
When should an MOS varactor be used in place of a varactor diode?
I was reading about voltage controlled oscillators in this article. Towards the bottom of the article, the authors display this figure when discussing varactor diodes: I'd never heard of an MOS ...
- 57
5 votes
1 answer
293 views
Oscillator Varactor Problem
I am trying to alter oscillation frequency of an oscillator with varactor diode MV2201. The oscillator circuit bellow without the varactor connected oscillates at 100Mhz. But when i connect the ...
- 53
0 votes
0 answers
122 views
Advice on using vias to connect two sides of a PCB together to maintain a circuit through a copper plate
I am currently designing a circuit for an intelligent reflective surface system where varactors are used to control the resonance of a unit cell through the capacitance they produce which will control ...
- 47
1 vote
3 answers
435 views
Biasing a varactor diode with AC voltage
I am trying to design a resonant (LC) circuit whose resonant frequency is sensitive to an AC voltage signal so that by tracking changes in resonant frequency I can extract the underlying voltage. The ...
- 57
0 votes
1 answer
198 views
Resonant frequency of a tuning circuit with varactors
This is the circuit that I'm simulating in LTSpice: I measured the experimental resonant frequency of the circuit by finding the frequency at which \$V_\text{out}\$ peaks for different values of \$...
- 560
12 votes
1 answer
1k views
Voltage-tunable capacitors -- how do they work, specifically those from Murata?
I'm curious about how MURATA variable capacitors work, for example, parts from the family LXRW0YV330-056. As far as I can tell, these are not semiconductor varactors, but based on some other physical ...
- 121
0 votes
3 answers
845 views
Request for circuit review: varactor-tuned AM radio receiver
I apologize if this is not the place for newbie questions or circuit review requests, but I was hoping for some wisdom on an AM receiver circuit I have sketched out. From left to right it is intended ...
