3 ms·
> solid state variable caps Varicaps are only good for low power and are kind of nonlinear, but it's a voltage controlled capacitance. I think for lower frequ
by hatsunearu 7y ago
> solid state variable caps
Varicaps are only good for low power and are kind of nonlinear, but it's a voltage controlled capacitance.
I think for lower frequencies, a capacitor bank that's switched is the best bet.
In terms of inductors, AFAIK other than an inductor matrix it doesn't exist, but i think you can build a virtual inductor using a GIC.
- jackyinger 7y agoDiodes exhibit capacitance that varies with respect to their DC bias. I know this is used in GHz RF applications. Using opamps to create virtual reactive components (capacitors, or inductors) that would otherwise be impractical to build directly (too high of value) is an interesting trick.
- hatsunearu 7y ago> Diodes exhibit capacitance that varies with respect to their DC bias. I know this is used in GHz RF applications. Oops, I meant to say varactor, not varicap. And this is used for VHF and up as well. The GIC-based filters are used a lot for high-Q parametric filters often in audio or general scientific stuff.
- madengr 7y agoPeregrine makes several digitally tunable capacitors (switched capacitor banks) that work to S-band and can handle moderate power. I have used them for antenna tuning. https://www.psemi.com/products/digitally-tunable-capacitors-dtc https://www.psemi.com/products/digitally-tunable-capacitors-...