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How to calculate the theoretical capacitor value of class E SSTC

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LAN_403

hsieh

Tue May 17 2011, 04:01PM

Registered Member #1412 Joined: Thu Mar 27 2008, 04:07PM
Location: Taipei Taiwan
Posts: 278

I am planning to build a class E SSTC.I had read Steve's page already.

But I want to know if there is any way to calculate the value of tank capacitor C6?Can I start with a theoretical value and fine tune it instead of totally try and error?

I have a oscilloscope but I only has one probe.Can I tune it with only one probe? Or I should buy another probe?

Thanks

JKowalski

Wed May 18 2011, 01:07AM

Registered Member #3595 Joined: Mon Jan 10 2011, 04:46AM
Location:
Posts: 26

It's easier to test it since there are so many stray capacitances and inductances guaranteed to show up in your setup.

Remember though that to calculate it you need to first find out what inductance shows up in the tank - that's another calc to make first. Might as well just measure things from the get-go.

Also remember that MOSFETs have a significant drain-source capacitance (which does vary)

You want your capacitor in parallel to be somewhat larger then this D-S capacitance so that you have a little more stability in your tank (the parallel fixed capacitor has more effect on the resonant frequency then the somewhat variable DS capacitance, it overwhelms it slightly).

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