GaN fet ring oscillator

Jun 14, 2021 Last reply: 5 years ago 6 Replies

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I think the frequency should settle down to 1/(10*Tpd) but it doesn't.



We might do some pcb footprint tests for the tiny EPC fets, and I thought a board with a lot of ring oscillators would be a good way to test for good soldering.



The EPC data sheet recommends a tiny solder-mask-defined pad arrangement that the board houses don't do well. I want to try some big klunky pads with conventional mask clearances.


Am 14.06.21 um 17:27 schrieb snipped-for-privacy@highlandsniptechnology.com:

JLCPCB had absolutely no problem with the datasheet pads. All it did was to trigger a request for confirmation that solder mask ON parts of the pad was intended.

Gerhard

PCBWAY did this:

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Q1 is horrible.

And a US board house recently complained about the solder mask resolution requirement. I like the idea of bigger conventional pads; the thermals will be better too.

Try WellPCB.

US board houses are good at getting the most out of 20-year-old processes and equipment, and at whining about competition from China, but not at much else.

-- john, KE5FX

My proto boards just arrived.

This is pretty ugly:

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Nah, Pentalogix and Screaming Circuits are both tops.

Cheers

Phil Hobbs

Blech. Who perpetrated that one?

Cheers

Phil Hobbs

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