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Electronic tuning (high voltage varactors)
I'm looking for suggestions on how one might go about changing the effective
capacitance of a resonant circuit (it's part of a filter) in order to change the center frequency. The tricky part is that there's ~30dBm (10Vpp) RF running around, so with standard varactor diodes the RF becomes 'the bias' and the tuning is destroyed. I'm told that there are 'high voltage' varactor diodes out there; does anyone have a recommended source? This is at 500MHz and the nominal component values are ~3pF. If I could obtain a 2:1 tuning range, I'd be happy. I need perhaps 30 steps within that range (3-6pF), and (doing the calculations) each step changes the capacitance by little more than about 100fF to start with -- so I'm thinking that switching physical capacitors into and out of the circuit is out of the question here. Thoughts? Thanks in advance, ---Joel Kolstad |
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