On a sunny day (Sat, 30 Apr 2022 08:51:18 -0700) it happened jlarkin@highlandsniptechnology.com wrote in <tglq6h13k2cmildj7d58egf57tqfotprhc@4ax.com>:>On Sat, 30 Apr 2022 15:02:22 GMT, Jan Panteltje ><pNaonStpealmtje@yahoo.com> wrote: > >>On a sunny day (Sat, 30 Apr 2022 07:33:46 -0700) it happened >>jlarkin@highlandsniptechnology.com wrote in >><qvhq6htpluaun4ka3v0u07p9tmanusip7p@4ax.com>: >> >>>On Sat, 30 Apr 2022 06:36:03 GMT, Jan Panteltje >>><pNaonStpealmtje@yahoo.com> wrote: >>> >>>>On a sunny day (Fri, 29 Apr 2022 10:40:05 -0700) it happened John Larkin >>>><jlarkin@highland_atwork_technology.com> wrote in >>>><dc8o6hpc2pges9sqe5bu71at2g531pg17o@4ax.com>: >>>> >>>>> >>>>>https://www.dropbox.com/sh/tgu2ozch3rbgglk/AABI3U3_iexb69UHWoRIzm-Ma?dl=0 >>>>> >>>>>Interesting. The high junction drops might be the SiGe, or just the >>>>>tiny junction size. >>>>> >>>>>It would make a decent 0.3 pF 13 volt diode. >>>>> >>>>>I might make an oscillator and evaluate phase noise/jitter. >>>>> >>>>>An x-ray would be cool. We need a high-res xray machine. >>>> >>>>Does not seem so much different from other RF NPN in satellite LNBs? >>>>Millions of those around. >>>>? >>> >>>The SiGe's are just 2x or 3x faster than regular rf bipolars. >>> >>>I just figured that I should get some and play with them. Maybe >>>explore saturation and switching, and build an oscillator maybe. Can't >>>design with tubes forever. >> >>I was looking at the noise level, very important for LNBs.. >>Indeed would be fun to to test a few, >>been working in the garden for hours, did put a peach seed in the ground in a sunny place, >>wonder if it will grow into a tree. > >We have a wonderful Meyer lemon tree in our tiny back yard. Neignbors >drop in when they need a lemon or two, and a couple are trying to >clone it from seeds or cuttings. > >https://www.dropbox.com/s/kgmvedhuhsn76x3/Mo_and_lemons.jpg?raw=1Nice!>https://www.dropbox.com/s/1f5ux77p6o12w7k/Lemon-pumpkin.jpg?raw=1 > >https://www.dropbox.com/s/kwzfbkv1ua41p9i/Lemons_Post-Rat.JPG?raw=1 > >Our side of our street slopes down to the south, so we get sun... when >it's not foggy like today. The people across the street have dark dank >mouldy back yards where things don't grow well.The front has always sun here, but parts of the back garden which is much larger, on the north side, only have sun in the afternoon. Gets better each month, but weather is a bit strange lately can go down to 1 degree C is predicted this week, north wind and dry, usually it if from the west (sea) and rains a lot. http://panteltje.com/pub/house_top_vie>These people across the street have a spiral staircase leading to >their small farm on top the cliff, where they have sun. He brews beer >too. > >https://www.dropbox.com/s/r7ji04b7mfj0pt5/Arbor_Small_Farm.jpg?raw=1>It took a big crew and a giant crane to lift the steel staircase over >the house into the back yard. The payback in veggies is probably 300 >years or so.Yea, I have a small road around the back. Grapes grow in the back of the garden. http://panteltje.com/pub/garden_IXIMG_0763.JPG lots of plants on the right side.
some BFP640 SiGe measurements
Started by ●April 29, 2022
Reply by ●April 30, 20222022-04-30
Reply by ●April 30, 20222022-04-30
On 4/29/2022 22:20, John Larkin wrote:> On Fri, 29 Apr 2022 21:43:30 +0300, Dimiter_Popoff <dp@tgi-sci.com> > wrote: > >> On 4/29/2022 20:40, John Larkin wrote: >>> >>> https://www.dropbox.com/sh/tgu2ozch3rbgglk/AABI3U3_iexb69UHWoRIzm-Ma?dl=0 >>> >>> Interesting. The high junction drops might be the SiGe, or just the >>> tiny junction size. >>> >>> It would make a decent 0.3 pF 13 volt diode. >>> >>> I might make an oscillator and evaluate phase noise/jitter. >>> >>> An x-ray would be cool. We need a high-res xray machine. >>> >>> >> >> Hah! Thanks for mentioning the diode thing, I may eventually build >> a pulse generator using it, needed something like that for a switch. >> (Don't hold your breath, it's been decades so far :). > > I want to do a benchtop pulse generator, but it would be a lot of > work. It would have to be fast (at least 1 GHz rate, 100 ps edges, 5 > volts at least) to be profitable; the slower stuff is cheap. > > A fast fpga SERDES could generate many channels, patterns even, but > the outputs would be clock quantized. > > I have some data on the MiniCircuits SAV series phemts, as switches, > if that's interesting. S-params are not useful in switching > applications. >My plan is not to build something we can sell, it is just for me to use. Could have used it some 25 years ago at least :-). The mercury wetted relay based pulser I put together back in 1994 or so did it, still does it actually (in a housing I would be ashamed to show...). But still, I might put in a few days and build one. The idea is to do two current sources (fast and precision both of them, FET opamp with p-fet (e.g. sst176)) charging a capacitor and diode switches to turn the charging on/off (say 100ns charge to 1V then leave it to discharge at some 50 or 100 us RC).
Reply by ●April 30, 20222022-04-30
On Sat, 30 Apr 2022 03:04:26 +0200, Gerhard Hoffmann <dk4xp@arcor.de> wrote:>Am 29.04.22 um 21:20 schrieb John Larkin: >> On Fri, 29 Apr 2022 21:43:30 +0300, Dimiter_Popoff <dp@tgi-sci.com> >> wrote: >> >>> On 4/29/2022 20:40, John Larkin wrote: >>>> >>>> https://www.dropbox.com/sh/tgu2ozch3rbgglk/AABI3U3_iexb69UHWoRIzm-Ma?dl=0 >>>> >>>> Interesting. The high junction drops might be the SiGe, or just the >>>> tiny junction size. >>>> >>>> It would make a decent 0.3 pF 13 volt diode. >>>> >>>> I might make an oscillator and evaluate phase noise/jitter. >>>> >>>> An x-ray would be cool. We need a high-res xray machine. >>>> > >A customer of mine used an ultrasonics microscope, long time ago. > >The Infineon spice model has the effect of bond wires etc, >separated from the bare chip. > >Oh, and 1/f also. What unusual luxury! > >And under which conditions the spice model delivers correct s-parameters! > >Someone must have done his homework in Munich. > > >>> Hah! Thanks for mentioning the diode thing, I may eventually build >>> a pulse generator using it, needed something like that for a switch. >>> (Don't hold your breath, it's been decades so far :). >> >> I want to do a benchtop pulse generator, but it would be a lot of >> work. It would have to be fast (at least 1 GHz rate, 100 ps edges, 5 >> volts at least) to be profitable; the slower stuff is cheap. >> >> A fast fpga SERDES could generate many channels, patterns even, but >> the outputs would be clock quantized. >> >> I have some data on the MiniCircuits SAV series phemts, as switches, >> if that's interesting. S-params are not useful in switching >> applications. > >Of course, they are. Some network analyzers can do the FFT >voodoo per push botton to convert between time & frequency >domain.But that's all small-signal linear. No fun at all. -- Anybody can count to one. - Robert Widlar
Reply by ●April 30, 20222022-04-30
On 1/5/22 1:51 am, jlarkin@highlandsniptechnology.com wrote:> On Sat, 30 Apr 2022 15:02:22 GMT, Jan Panteltje > <pNaonStpealmtje@yahoo.com> wrote: >> been working in the garden for hours, did put a peach seed in the ground in a sunny place, >> wonder if it will grow into a tree. > > We have a wonderful Meyer lemon tree in our tiny back yard. Neignbors > drop in when they need a lemon or two, and a couple are trying to > clone it from seeds or cuttings.Happiness is a happy Meyer lemon - so prolific. But you probably need to graft it to an appropriate root-stock. A cutting won't grow happy roots, and a seed won't give you a clone.> https://www.dropbox.com/s/kwzfbkv1ua41p9i/Lemons_Post-Rat.JPG?raw=1For the rats, get a 20l bucket, the tall kind that trades use. Put a bit of broomstick across the top with 3 bits of PVC pipe so they spin. Put 8" of water in the bottom, raise up the handle and bait it with peanut butter. Rats step onto the tubes, fall in and drown. Someone near here got nine in just one night.> https://www.dropbox.com/s/r7ji04b7mfj0pt5/Arbor_Small_Farm.jpg?raw=1Did you intend to doxx yourself? <https://goo.gl/maps/yjoW4e8KAEhxjdEE8>> It took a big crew and a giant crane to lift the steel staircase over > the house into the back yard. The payback in veggies is probably 300 > years or so.We're also on a steep rocky slope, but the block is wide and the rock forms ramps - it's a long walk from the street to the furthest point, because you traverse the block side-to-side three times (35m wide at the back). It's amazingly productive though - we have over 35 kinds of food plants growing. It's better than weeds, at least. CH
Reply by ●April 30, 20222022-04-30
On Sun, 1 May 2022 09:32:48 +1000, Clifford Heath <no.spam@please.net> wrote:>On 1/5/22 1:51 am, jlarkin@highlandsniptechnology.com wrote: >> On Sat, 30 Apr 2022 15:02:22 GMT, Jan Panteltje >> <pNaonStpealmtje@yahoo.com> wrote: >>> been working in the garden for hours, did put a peach seed in the ground in a sunny place, >>> wonder if it will grow into a tree. >> >> We have a wonderful Meyer lemon tree in our tiny back yard. Neignbors >> drop in when they need a lemon or two, and a couple are trying to >> clone it from seeds or cuttings. > >Happiness is a happy Meyer lemon - so prolific. But you probably need to >graft it to an appropriate root-stock. A cutting won't grow happy roots, >and a seed won't give you a clone. > >> https://www.dropbox.com/s/kwzfbkv1ua41p9i/Lemons_Post-Rat.JPG?raw=1We did buy it from a garden center, so it was probably grafted.> >For the rats, get a 20l bucket, the tall kind that trades use. Put a bit >of broomstick across the top with 3 bits of PVC pipe so they spin. Put >8" of water in the bottom, raise up the handle and bait it with peanut >butter. Rats step onto the tubes, fall in and drown. Someone near here >got nine in just one night.I put an LED light near the base and that keeps them away.> >> https://www.dropbox.com/s/r7ji04b7mfj0pt5/Arbor_Small_Farm.jpg?raw=1 > >Did you intend to doxx yourself? <https://goo.gl/maps/yjoW4e8KAEhxjdEE8>Well, you just did. I use my real name so anybody who really tries can find me. I'll offer visitors a beer.> >> It took a big crew and a giant crane to lift the steel staircase over >> the house into the back yard. The payback in veggies is probably 300 >> years or so. > >We're also on a steep rocky slope, but the block is wide and the rock >forms ramps - it's a long walk from the street to the furthest point, >because you traverse the block side-to-side three times (35m wide at the >back). It's amazingly productive though - we have over 35 kinds of food >plants growing. It's better than weeds, at least. > >CHA rocky slope is supposed to be best for earthquakes. Less sloshing, and the houses are anchored in the rock. -- Anybody can count to one. - Robert Widlar
Reply by ●April 30, 20222022-04-30
jlarkin@highlandsniptechnology.com wrote:> On Sat, 30 Apr 2022 06:36:03 GMT, Jan Panteltje > <pNaonStpealmtje@yahoo.com> wrote: > >> On a sunny day (Fri, 29 Apr 2022 10:40:05 -0700) it happened John Larkin >> <jlarkin@highland_atwork_technology.com> wrote in >> <dc8o6hpc2pges9sqe5bu71at2g531pg17o@4ax.com>: >> >>> >>> https://www.dropbox.com/sh/tgu2ozch3rbgglk/AABI3U3_iexb69UHWoRIzm-Ma?dl=0 >>> >>> Interesting. The high junction drops might be the SiGe, or just the >>> tiny junction size. >>> >>> It would make a decent 0.3 pF 13 volt diode. >>> >>> I might make an oscillator and evaluate phase noise/jitter. >>> >>> An x-ray would be cool. We need a high-res xray machine. >> >> Does not seem so much different from ovther RF NPN in satellite LNBs? >> Millions of those around. >> ? > > The SiGe's are just 2x or 3x faster than regular rf bipolars. > > I just figured that I should get some and play with them. Maybe > explore saturation and switching, and build an oscillator maybe. Can't > design with tubes forever.It's more than that--their collector impedances are much larger, so you can run much higher voltage gain, and their Rbb' is very very low, so their voltage noise is too. They make beautiful cascode devices for pHEMTs. A BLM15BA050 bead in the base lead makes them very well behaved. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com
Reply by ●April 30, 20222022-04-30
On 1/5/22 11:35 am, jlarkin@highlandsniptechnology.com wrote:> I use my real name so anybody who really tries can find me. I'll offer > visitors a beer.Same. I figure anonymity is a lost cause.
Reply by ●May 2, 20222022-05-02
On Sun, 1 May 2022 12:19:21 +1000, Clifford Heath <no.spam@please.net> wrote:>On 1/5/22 11:35 am, jlarkin@highlandsniptechnology.com wrote: >> I use my real name so anybody who really tries can find me. I'll offer >> visitors a beer. > >Same. I figure anonymity is a lost cause.Especially when jerks want to be cute. -- If a man will begin with certainties, he shall end with doubts, but if he will be content to begin with doubts he shall end in certainties. Francis Bacon
Reply by ●May 2, 20222022-05-02
On a sunny day (Mon, 02 May 2022 09:42:51 -0700) it happened John Larkin <jlarkin@highland_atwork_technology.com> wrote in <df207hp9hsu0e6k8n421g85n3dek50bn73@4ax.com>:>On Sun, 1 May 2022 12:19:21 +1000, Clifford Heath <no.spam@please.net> >wrote: > >>On 1/5/22 11:35 am, jlarkin@highlandsniptechnology.com wrote: >>> I use my real name so anybody who really tries can find me. I'll offer >>> visitors a beer. >> >>Same. I figure anonymity is a lost cause. > >Especially when jerks want to be cute.I even have my GPS coordinates in some pictures I posted... :-) "You know who I am, you stared at thet sun,. I am the one who loves changing from nothing to one" "Leonard Cohen, Songs from a room" sigs... :-)
Reply by ●May 2, 20222022-05-02
On 3/5/22 2:42 am, John Larkin wrote:> On Sun, 1 May 2022 12:19:21 +1000, Clifford Heath <no.spam@please.net> > wrote: > >> On 1/5/22 11:35 am, jlarkin@highlandsniptechnology.com wrote: >>> I use my real name so anybody who really tries can find me. I'll offer >>> visitors a beer. >> >> Same. I figure anonymity is a lost cause. > > Especially when jerks want to be cute. >You're the one who posted your street name and a photo of your backyard. Your Meyer lemon tree is clearly visible on Google aerial imagery. shrug
