WA1MBA MUD 2010 B.pdf - NTMS

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History Version 4• During 2009/<strong>2010</strong> Al measured poorresults and found that with the addition ofexternal tuner could improve from 11-ishdB nf to 7-ish dB• Output external tuner could improve gainfrom 12-ish dB to 20-ish dB• I asked for units back• I reviewed the internals and saw twothings wrong
History Version 4• Firstly, all those units were constructed withprototype milled RF boards.– They traces were OK, but were not nearly as cleanedged as (subsequently) professionally made ones.– They had some surface dielectric milled away• Secondly, all prototypes had long ribbon bondsin an attempt to simulate relatively highinductance wire bonds– This was basically a mistake– Ribbon (wedge) bonds are far superior, lowerinductance and the longer ribbons just made thingsworse
Page 1 and 2: 78 GHz LNA Project StatusReportWA1M
Page 4 and 5: History - How did we get here• Se
Page 8 and 9: Poor boards, Long bondsRough board
Page 10 and 11: Good boards, Short bondsSmooth boar
Page 12: Unit 6Gain went from 9.3 dBTo 28.9
Page 15: Repeatability• Continued to repla
Page 18 and 19: Next Steps• We need to have addit
Page 20 and 21: Next Steps• Bodies need slight mo
Page 23 and 24: Outline• History- How did we get
Page 25 and 26: Cost - 78 GHz Amp ProjectPARTSDigik
Page 27: Process of Ordering• Money will h

WA1MBA MUD 2010 B.pdf - NTMS

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