On Wed, 15 Feb 2012 19:48:02 +0100, Fred Bartoli <" "> wrote:>John Larkin a �crit : >> On Mon, 13 Feb 2012 20:03:34 -0800, Robert Baer >> <robertbaer@localnet.com> wrote: >> >>> Phil Hobbs wrote: >>>> On 02/13/2012 03:12 AM, Okkim Atnarivik wrote: >>>>> Phil Hobbs<pcdhSpamMeSenseless@electrooptical.net> wrote: >>>>> : I started by taking your advice, which was pretty valuable--thanks >>>>> >>>>> Don't mention it. I have already gained more from your, Larkin's, >>>>> Win Hill's and many other's posts here in SED. >>>>> >>>>> : again. I noticed the change in specs as well, when I ordered another >>>>> : batch a couple of months ago. They changed the type number to BFP650H >>>>> : instead of BFP650E when they changed the process. (The dogs.) >>>>> >>>>> They did? The datasheet still list the part as BFP650 without suffixes >>>>> even though it is the SiGe:C version. >>>> The distributors' stock of the E version all ran out a few months ago, >>>> and all they have now is the H version. I haven't managed to get the >>>> straight story as to just what they did. >>>> >>>>> : I'm using it as a cascode stage for a SKY65050 pHEMT, and it works >>>>> >>>>> Interesting hint, I should give it a try. >>>>> >>>>> : great. One of the best things about it is that it has effectively >>>>> : infinite Early voltage, so you can get a lot of voltage gain out of a >>>>> : single stage. Even for situations where you don't care so much about >>>>> : ultralow noise, the combination of a gigantic f_T with a very high V_A >>>>> : is unique in my collection. It does want to oscillate at 14 GHz if you >>>>> : look at it crosswise, but a nice 5-ohm bead in series with the base >>>>> : cleans that right up. >>>>> >>>>> The high Early seems to be characteristic to the SiGe's, it puzzled me >>>>> already in the thread http://tinyurl.com/8a44pzn . If you check the >>>>> page 4 of http://tinyurl.com/6qmnd4u you see it there too (and >>>>> additionally >>>>> you get the large hFE = 400 ). >>>> I've ordered some of those too, thanks. It's a bit worrying that there >>>> are seem to be only about 100 of them in the world, according to FindChips. >>>> >>>> Cheers >>>> >>>> Phil >>>>> Regards, >>>>> Mikko >>>> >>> Oh..i like that non-functional circuit on page two.. >> >> Wow, that's pretty bad. >> > >And the comments above the wonderful circuit is pretty bad as well... > >Yeah, could you please translate that into English for us? -- John Larkin, President Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
picosecond test points
Started by ●February 11, 2012
Reply by ●February 16, 20122012-02-16
