crisp@ecsvax.uncecs.edu (Russ Crisp) (06/14/91)
Hello again fellow netlanders. I'm interested in building a couple of low-noise high-gain vhf-uhf preamps, and have been told that MMIC's are great little devices for such purposes, since they are stable, and most configurations require but a few external components. I've searched through all my catalogs, Digi-Key, Mouser, Newark, etc.. and there is no mention of MMIC's in any of them. My question for some knowledgable person(s) on the net is: Where can I find: 1) a source of MMIC's and 2) some information, and possibly circuit ideas on the pratical application of these devices. If I knew the name of a manufacturer, I could call on them for info, but I'm totally in the dark here. Can some kind soul help me out? Thanks very much! Russ Crisp Western Carolina Univers
mcovingt@athena.cs.uga.edu (Michael A. Covington) (06/14/91)
MMICs were discussed at length in QST, late 1987, and there is some information in any post-1987 ARRL Handbook. -- ------------------------------------------------------- Michael A. Covington | Artificial Intelligence Programs The University of Georgia | Athens, GA 30602 U.S.A. -------------------------------------------------------
gd@erg.sri.com (Greg DesBrisay) (06/14/91)
Check out Mini-Circuits in Brooklyn, NY, and Avantek in Santa Clara, CA. Greg gd@sri.com In article <1991Jun13.193138.3656@ecsvax.uncecs.edu> crisp@ecsvax.uncecs.edu (Russ Crisp) writes: > >Hello again fellow netlanders. > >I'm interested in building a couple of low-noise high-gain >vhf-uhf preamps, and have been told that MMIC's are great >little devices for such purposes, since they are stable, and >most configurations require but a few external components. > >I've searched through all my catalogs, Digi-Key, Mouser, >Newark, etc.. and there is no mention of MMIC's in any >of them. My question for some knowledgable person(s) >on the net is: Where can I find: 1) a source of MMIC's >and 2) some information, and possibly circuit ideas on >the pratical application of these devices. If I knew >the name of a manufacturer, I could call on them for info, >but I'm totally in the dark here. Can some kind soul >help me out? > >Thanks very much! >Russ Crisp >Western Carolina Univers
frankb@hpsad.HP.COM (Frank Ball) (06/15/91)
/ crisp@ecsvax.uncecs.edu (Russ Crisp) / 12:31 pm Jun 13, 1991 / *I've searched through all my catalogs, Digi-Key, Mouser, *Newark, etc.. and there is no mention of MMIC's in any *of them. My question for some knowledgable person(s) *on the net is: Where can I find: 1) a source of MMIC's *and 2) some information, and possibly circuit ideas on *the pratical application of these devices. If I knew *the name of a manufacturer, I could call on them for info, *but I'm totally in the dark here. Can some kind soul *help me out? Avantek Inc. 3175 Bowers Ave. Santa Clara CA 95054 408-727-0700 They make quite a variety. They have MSA-XXXX style part numbers. They are very good and cheap. example: MSA-1105 3dB bandwidth 50 MHz - 1.3 GHz 3.6 dB noise figure typ at 500 MHz 12 dB typ gain at 500 MHz third order intercept point +30 dBm at 500 MHz Mini Circuits PO Box 166 Brooklyn, New York 11235 718-934-4500 MAR-X style part numbers. Very similar to Avantek, slightly lower TOI specs. Cheaper. I think these are made by Avantek, but didn't quite meet Avantek's specs. They are very easy to use. They require input and output DC blocking capacitors and a DC bias on the output (with a resistor and maybe an inductor). They are 50 ohms in/out. Higher gain parts have exellent noise figure, but poorer flatness and TOI. Low gain parts have worse noise figure. They are very stable devices. Frank Ball frankb@hpsad.HP.COM pyramid!hplabs!hpsad!frankb