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Homebrew Equipment A place to show, design and discuss the weird and wonderful electronic creations from the hands of individual members. |
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28th Feb 2019, 7:52 am | #21 |
No Longer a Member
Join Date: Oct 2016
Location: Maroochydore, Queensland, Australia.
Posts: 2,679
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Re: Magloop Antenna Using ebay LNA
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28th Feb 2019, 3:21 pm | #22 | |
Dekatron
Join Date: Apr 2009
Location: Oxfordshire, UK.
Posts: 4,935
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Re: Magloop Antenna Using ebay LNA
Quote:
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28th Feb 2019, 4:27 pm | #23 |
Dekatron
Join Date: Sep 2010
Location: Cheltenham, Gloucestershire, UK.
Posts: 3,077
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Re: Magloop Antenna Using ebay LNA
Yes, the INA02186 MMIC is a very scary part. As I think I mentioned on your other thread this MMIC will have two stages and the two stages share the common ground legs of the '86 plastic package. I'd actually argue that this is a tad reckless by the manufacturer when they put this MMIC inside the 86 plastic package with its long ground legs. I think this MMIC is better to use in the '70 package as the INA-02170. It will tolerate a tiny bit more inductance in the PCB grounding before going unstable.
To use the INA02186 on a PCB I think you are supposed to use a very thin PCB material and lots of chunky via holes. It obviously must be possible to get it to test out as unconditionally stable when fitted to a well designed PCB but there will be virtually no margin for error. At a ballpark estimate I think the overall ground inductance would need to be <0.1nH per leg. This can realistically only be achieved with a skinny PCB and lots of fat via holes.
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Regards, Jeremy G0HZU |