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Questions tagged [varicap]

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1
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2answers
77 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 ...
7
votes
2answers
222 views

1977 GE 6RS20SP9B9 - what the heck is this component?

Ok so, ordinarily I'd not ask a "what is this" question, but this component really has me scratching my head - both at its function in the circuit and how it is constructed. Anyone know what a GE ...
0
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3answers
117 views

Multi-tuning AM selector

I'm thinking about the design of an AM receiver frontend that needs to select between three channels. The community suggested that I investigate manually wound loop antennas, and they seem like a nice ...
2
votes
0answers
312 views

Simulating varicap diode in LTSpice

I have been looking into making a voltage controlled oscillator using varicap diodes, however I have had hard time simulating the diodes in spice. Would anyone here have an idea how this would be ...
0
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0answers
249 views

How can I create a varicap in ADS?

I need to create a varying capacitor, so I'm trying to make a varicap in ADS. However, there are only diodes, and I don't know how to make a varicap. Can you point me to some resources or walk me ...
1
vote
1answer
357 views

Is BBY40 a good substitute for MV209 in this RF receiver?

VD1, indicated by the red circle in this is a varactor diode and the suggestion given for the varactor diode in this manual is MV209. It seems to be outdated and so are many other components. How do ...
1
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2answers
1k views

Using a varactor diode to tune a resonance frequency

I think this is a question is some very elementary circuit design but... I want to use a varactor diode to tune the resonance frequency of a resonator I have built. I understand that a varactor is a ...
1
vote
1answer
122 views

VCO doesn't work

I've tried to design a voltage controlled oscillator by adding a varactor to a Colpitts oscillator. However simulation shows no change in the oscillation frequency as V3 changes (0.04v to 10v). I ...
-1
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3answers
214 views

Can you switch between 2 tank circuits using a relay?

Say I have an oscillator that needs to span between 1 GHz and 1 Mhz. Ill be controlling it with a microcontroller, probably an arduino. According to this, http://faculty.mu.edu.sa/public/uploads/...
0
votes
2answers
455 views

How to boost (double voltage) a sawtooth generator

I have a circuit to drive, using a sawtooth generator, four varactor diodes (FC54). These varactor diodes has the following specs: from 2.5pF (at 15V) to 30pF (at 0V), but my sawtooth generator, based ...