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John Larkin
Guest
Mon Feb 04, 2019 11:45 pm
https://www.amazon.com/gp/product/B07D1GMXMD/ref=ppx_yo_dt_b_asin_title_o02__o00_s00?ie=UTF8&psc=1
We needed some bias tees so I tried Amazon. Prime, extra $4 for
overnight delivery.
Amazon is amazing.
We TDRd them, and they really are pretty good 6 GHz tees.
Gotta open one up and see what's inside.
--
John Larkin Highland Technology, Inc
picosecond timing precision measurement
jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
Clifford Heath
Guest
Tue Feb 05, 2019 12:45 am
On 5/2/19 9:28 am, John Larkin wrote:
Quote:
Have you played with conical-wound broadband inductors? There are some
amazing examples. E.g. <https://www.coilcraft.com/conicals/index.cfm>
Clifford Heath
bitrex
Guest
Tue Feb 05, 2019 12:45 am
On 02/04/2019 05:28 PM, John Larkin wrote:
Quote:
Capacitor and two pieces of wire?
bitrex
Guest
Tue Feb 05, 2019 12:45 am
On 02/04/2019 06:27 PM, bitrex wrote:
Quote:
To first order
George Herold
Guest
Tue Feb 05, 2019 1:45 am
On Monday, February 4, 2019 at 5:28:11 PM UTC-5, John Larkin wrote:
Quote:
https://www.amazon.com/gp/product/B07D1GMXMD/ref=ppx_yo_dt_b_asin_title_o02__o00_s00?ie=UTF8&psc=1
We needed some bias tees so I tried Amazon. Prime, extra $4 for
overnight delivery.
Amazon is amazing.
We TDRd them, and they really are pretty good 6 GHz tees.
Gotta open one up and see what's inside.
Huh, will you post pics?
I did a bias Tee in our laser head, I've only tested it to
~ 200 MHz.... (no HF source) I'm very sure it does not
go to 6 GHz. (but that would be a cool frequency to get to!)
(Rb hyper-fine transitions and all.)
George H.
Quote:
John Larkin
Guest
Tue Feb 05, 2019 1:45 am
On Tue, 5 Feb 2019 10:13:26 +1100, Clifford Heath <no.spam_at_please.net>
wrote:
Quote:
On 5/2/19 9:28 am, John Larkin wrote:
https://www.amazon.com/gp/product/B07D1GMXMD/ref=ppx_yo_dt_b_asin_title_o02__o00_s00?ie=UTF8&psc=1
We needed some bias tees so I tried Amazon. Prime, extra $4 for
overnight delivery.
Amazon is amazing.
We TDRd them, and they really are pretty good 6 GHz tees.
Gotta open one up and see what's inside.
Have you played with conical-wound broadband inductors? There are some
amazing examples. E.g. <https://www.coilcraft.com/conicals/index.cfm
Clifford Heath
Yes, we'll probably use them in production. The bias tees are for
testing parts first.
It looks like the Piconics patents ran out, so other people are making
conicals. Prices have dropped roughly 4:1.
These are cool, ferrite filled like the conicals but higher current.
https://www.coilcraft.com/4310lc.cfm
--
John Larkin Highland Technology, Inc
picosecond timing precision measurement
jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
John Larkin
Guest
Tue Feb 05, 2019 1:45 am
On Mon, 4 Feb 2019 18:27:24 -0500, bitrex <user_at_example.net> wrote:
Quote:
https://www.dropbox.com/s/hz4wj3fltsetqqj/Amazon_Tee.jpg?dl=0
--
John Larkin Highland Technology, Inc
picosecond timing precision measurement
jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
Clifford Heath
Guest
Tue Feb 05, 2019 1:45 am
On 5/2/19 11:24 am, John Larkin wrote:
Quote:
On Tue, 5 Feb 2019 10:13:26 +1100, Clifford Heath <no.spam_at_please.net
wrote:
On 5/2/19 9:28 am, John Larkin wrote:
https://www.amazon.com/gp/product/B07D1GMXMD/ref=ppx_yo_dt_b_asin_title_o02__o00_s00?ie=UTF8&psc=1
We needed some bias tees so I tried Amazon. Prime, extra $4 for
overnight delivery.
Amazon is amazing.
We TDRd them, and they really are pretty good 6 GHz tees.
Gotta open one up and see what's inside.
Have you played with conical-wound broadband inductors? There are some
amazing examples. E.g. <https://www.coilcraft.com/conicals/index.cfm
Clifford Heath
Yes, we'll probably use them in production. The bias tees are for
testing parts first.
It looks like the Piconics patents ran out, so other people are making
conicals. Prices have dropped roughly 4:1.
These are cool, ferrite filled like the conicals but higher current.
https://www.coilcraft.com/4310lc.cfm
I don't understand how they can have "Flat bandwidth with high impedance
to 6 GHz" but an SRF of 235MHz. Surely if they turn capacitive above
235MHz they're still capacitive at 6GHz?
Clifford Heath.
bitrex
Guest
Tue Feb 05, 2019 2:45 am
On 02/04/2019 07:46 PM, George Herold wrote:
Quote:
$34 looks like.
Dang ain't nobody going hongry in the bias tee business!
Gerhard Hoffmann
Guest
Tue Feb 05, 2019 2:45 am
Am 05.02.19 um 00:13 schrieb Clifford Heath:
Quote:
A long time ago, we tried them for the DFB lasers in our fiberoptic
transceivers. Worked very good, but at $35 a pop impossible for
production. Thanks goddess, that Piconics patent has exspired now.
I once told the MCL sales guy that they might sell one for each
ERA-8 if the price was right. He was all ears. :-)
One of my colleagues put some RF ferrite into a mortar, added some
epoxy and formed a conical core himself. That looked ugly but
performed quite well. Cost a lot more than Piconics and was unfit
for production. But educating. :-)
For upto 10 GHz, 100nF 0402 is OK as the capacitor, esp. if you only
want nice optical eyes.
The choke is harder; it can be made from really cheap parts but
it takes a day at the VNA, some creative soldering and the inductor /
ferrite / resistor kit.
This here is a PicoSecondPulseLabs 5828-108 amplifier. 15 GHz / 22ps tr.
<
https://www.flickr.com/photos/137684711_at_N07/33112324418/in/dateposted-public/
>
and the notes I made when I opened it some years ago is to the right.
(and even further right some of Gerhard's adventures)
Data sheet of the amplifier:
<
https://www.oequest.com/getDatasheet/id/2116-2116.pdf >
Input is to the left, output right and on the underside there
is a CCS made from LM3xx. There is also some ferrite rubber
glued to the upper lid to dampen the box modes.
They use a monolayer capacitor that is about as wide as the
microstrip. The ustrip has just a narrow cut and the other side
of the monolayer cap is contacted with a piece of wide Cu foil.
Parallel to the monolayer C there are 2 additional 0402 caps,
soldered on top.
On the output side, there is a series RC to gnd after the first
coil to dampen some resonance. Don't use too much inductance to
push down the lower frequency limit. It stores energy and if
you short Vcc that may kill the amplifier chip / DUT.
cheers,
Gerhard
John Larkin
Guest
Tue Feb 05, 2019 2:45 am
On Mon, 4 Feb 2019 16:46:33 -0800 (PST), George Herold
<gherold_at_teachspin.com> wrote:
Quote:
No, $30 each. The extra $4 was for overnight delivery.
--
John Larkin Highland Technology, Inc
picosecond timing precision measurement
jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
George Herold
Guest
Tue Feb 05, 2019 2:45 am
On Monday, February 4, 2019 at 7:26:09 PM UTC-5, John Larkin wrote:
Quote:
The connector ground pads on the pcb look de-soldered?
Don't I want my pcb grounded right at the in/outputs?
(that's what I always do.)
George H.
Quote:
John Larkin
Guest
Tue Feb 05, 2019 2:45 am
On Mon, 4 Feb 2019 16:54:38 -0800 (PST), Simon S Aysdie
<gwhite_at_ti.com> wrote:
Quote:
On Monday, February 4, 2019 at 3:13:34 PM UTC-8, Clifford Heath wrote:
On 5/2/19 9:28 am, John Larkin wrote:
https://www.amazon.com/gp/product/B07D1GMXMD/ref=ppx_yo_dt_b_asin_title_o02__o00_s00?ie=UTF8&psc=1
We needed some bias tees so I tried Amazon. Prime, extra $4 for
overnight delivery.
Amazon is amazing.
We TDRd them, and they really are pretty good 6 GHz tees.
Gotta open one up and see what's inside.
Have you played with conical-wound broadband inductors? There are some
amazing examples. E.g. <https://www.coilcraft.com/conicals/index.cfm
Piconics was the first conical inductor company. Gowanda also sells them. AVX had some too, last I checked. Conicals are fragile and Production always hates them.
One has to be careful in interpreting current rating across vendors. John's Tee says 0.5 A, but no conditions accompany it. The CCI BCL-652JL is 6.5 uH and 650 mA causes a 40°C rise from 25°C. I'm not sure how the temperature delta is measured. It seems like a thermocouple would draw heat away from the thing it was measuring. For a small thing, maybe that matters.
One could measure its resistance, or thermal image it.
--
John Larkin Highland Technology, Inc
picosecond timing precision measurement
jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
Simon S Aysdie
Guest
Tue Feb 05, 2019 2:45 am
On Monday, February 4, 2019 at 4:46:38 PM UTC-8, George Herold wrote:
Quote:
$29. He paid an extra $4 for fast shipping.
George Herold
Guest
Tue Feb 05, 2019 2:45 am
On Monday, February 4, 2019 at 7:26:09 PM UTC-5, John Larkin wrote:
Quote:
That was $4.00?
Dang.
GH
Quote:
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