Hi It should be easier to DC screen individual diodes for flicker noise than RF test full mixers..
That of course *assumes* that there's a correlation between baseband and RF. Bob On Mar 27, 2010, at 4:32 PM, Bruce Griffiths wrote: > The potential advantage is that a typical 10514 using discrete diodes is > about 6dB quieter than a typical RPD-1 using a monolithic quad in the flicker > noise region. > > Bruce > > Bob Camp wrote: >> Hi >> >> You often see reels of parts on the auction sites at crazy prices. Somebody >> scrapped out a through hole pick and place loader and is selling off the >> inventory that was still in place. I've often though the one could get lucky >> and find a reel of rational diodes without spending a lot of money on them. >> >> Setting up to do the basic sort is definitely "basement compatible" sort of >> stuff. The tail end of the process would be to drop candidate quads into a >> fixture and see how they actually do in a real mixer. Still something you >> could do in the basement. >> >> The transformers you would wind are going to be a lot bigger than the ones >> MiniCircuits uses. I don't think that would be a problem in any most time >> nut basement settings. >> >> Bob >> >> On Mar 27, 2010, at 12:34 PM, Magnus Danielson wrote: >> >> >>> Ulrich Bangert wrote: >>> >>>>> It's not real clear that building a part with monolithic diode pairs or >>>>> quads buys much over a part from MiniCircuits. >>>>> >>>> Rumours are that the famous HP10514 is made from 4 discrete hand selected >>>> diodes. If you have thousands of diodes to select from building your own >>>> mixer may give sense. >>>> >>>> >>> Well, the HP10514 does have 4 individual diodes. Selection is certainly >>> being done. >>> >>> Using selection for other home-built stuff is done regularly in the >>> Synth-DIY world, so it is not too hard to do. Modern mixers use either the >>> same die or at last dies from the same place of the wafer to accomplish >>> close matching. >>> >>> Cheers, >>> Magnus >>> >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >>> >>> >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
