Coilcraft wideband inductor...

[John Larkin]

https://www.dropbox.com/sh/eheny8230wvg6e1/AAD7VQm95oVzaq3QkDYcpQAda?dl=0

It almost looks like a hi-Z transmission line, flat for a while, as
the TDR step propagates along the coil. Then it remembers to be an
inductor.

No visible resonances or capacitance. Nice part.

Adding a 27 nH inductor if anything makes it worse.

This is a nice alternate to a flimsy, expensive conical inductor.

 

[Phil Hobbs]

On 2020-07-16 15:19, John Larkin wrote:

https://www.dropbox.com/sh/eheny8230wvg6e1/AAD7VQm95oVzaq3QkDYcpQAda?dl=0

It almost looks like a hi-Z transmission line, flat for a while, as
the TDR step propagates along the coil. Then it remembers to be an
inductor.

No visible resonances or capacitance. Nice part.

Adding a 27 nH inductor if anything makes it worse.

This is a nice alternate to a flimsy, expensive conical inductor.


That is a nice part. What\'s the p/n?

Thanks

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

 

[Phil Hobbs]

On 2020-07-16 15:19, John Larkin wrote:

https://www.dropbox.com/sh/eheny8230wvg6e1/AAD7VQm95oVzaq3QkDYcpQAda?dl=0

It almost looks like a hi-Z transmission line, flat for a while, as
the TDR step propagates along the coil. Then it remembers to be an
inductor.

No visible resonances or capacitance. Nice part.

Adding a 27 nH inductor if anything makes it worse.

This is a nice alternate to a flimsy, expensive conical inductor.


That is a nice part. What\'s the p/n?

Thanks

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

 

[Phil Hobbs]

On 2020-07-16 15:19, John Larkin wrote:

https://www.dropbox.com/sh/eheny8230wvg6e1/AAD7VQm95oVzaq3QkDYcpQAda?dl=0

It almost looks like a hi-Z transmission line, flat for a while, as
the TDR step propagates along the coil. Then it remembers to be an
inductor.

No visible resonances or capacitance. Nice part.

Adding a 27 nH inductor if anything makes it worse.

This is a nice alternate to a flimsy, expensive conical inductor.


That is a nice part. What\'s the p/n?

Thanks

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

 

[John Larkin]

On Thu, 16 Jul 2020 17:00:51 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2020-07-16 15:19, John Larkin wrote:

https://www.dropbox.com/sh/eheny8230wvg6e1/AAD7VQm95oVzaq3QkDYcpQAda?dl=0

It almost looks like a hi-Z transmission line, flat for a while, as
the TDR step propagates along the coil. Then it remembers to be an
inductor.

No visible resonances or capacitance. Nice part.

Adding a 27 nH inductor if anything makes it worse.

This is a nice alternate to a flimsy, expensive conical inductor.


That is a nice part. What\'s the p/n?

Thanks

Phil Hobbs

COILCRAFT 4310LC-132KEB

I think they have some other parts in that series. Looks ferrite-epoxy
filled, or maybe just a ferrite rod.

We have a new board, a Mach-Zender modulator driver, that uses
conicals. They are giving us a lot of grief, and we need to spin the
board anyhow, so maybe we\'ll use these, probably with a tiny
additional inductor. The TDR rise time of these parts is a little
slow, around 100 ps.

I should TDR a conical too.

My ole 11802 is being weird about reflection coefficients and
impedances at the cursors, so I\'m not sure what the impedance of that
initial plateau is, but it\'s a lot more than 50 ohms.