Limpkin's blog - Easy-phi Project: High Speed Logic Gate - Comments<div>An electronics geek blog, dedicated to sharing and open source. Check out my stores: <a href="https://lectronz.com/stores/stephanelec" hreflang="en" title="Lectronz store">EU</a> / <a href="https://www.tindie.com/stores/stephanelec" hreflang="en" title="tindie store">EU & US</a>.</div>2024-03-27T19:19:38+00:00Mathieuurn:md5:51de6a3d917257edeff5a252fe925b02DotclearEasy-phi Project: High Speed Logic Gate - just some thoughtsurn:md5:f7c8f4df54afb17ce1315b84dce571352014-04-25T08:29:10+02:002014-04-25T08:42:48+02:00just some thoughts<p>Might I suggest you to involve a proper microwave engineer to enhance your knowledge about RF layout fundamentals. In the text above you are worried about reflections, but the layout seems to suggest otherwise. A very basic thing would be to place ground via's near the transitions to another layer, to avoid mode conversions. I am not only taking about odd to even mode conversion, but also about parallel plate mode excitation.<br />
Furthermore please perform some proper decoupling simulations, just throwing in a 10 nF seems a but high for these frequencies.<br />
For a 2 GHz digital signal, the layout should at least be capable of handling frequencies up to 6 GHz (3rd harmonic), which seems a bit high, to just use your low frequency layout concepts. It might have worked for for this board, but with just a view RF-'tricks' you can improve the signal quality for future boards.</p>