TO can package parasitics

Have you checked bitsavers.org or archive.org? Al Kossow has sent archive.org a lot of his scanned parts catalogues and reference manuals. Easier to find on bitsavers though...

John :-#)#

Can you TDR one?

You sure you mean TO-8 ?

TO-8 is a package that was used almost exclusively for power germanium parts.

RL

You might compare it to some laser diode packages for Mech/Elec strays.

Yup.

And a whole lot of larger-size optical detectors that aren't passivated well enough for non-hermetic packages.

Cheers

Phil Hobbs

I could if I had one handy, but ATM I'm dealing with a requirement to make a front end with ~ 350 MHz BW from a TO-8.

I'm trying to decide whether to have a go at it or insist on the goal posts being moved.

Cheers

Phil Hobbs

Thanks, Rob.

Cheers

Phil

Any idea why gold-plated kovar would reduce inductance by factor of

RL

Maybe they got the decimal point in the wrong place. Otherwise it doesn't make sense. John

Probably just closer to the baseplate--reduces loop area. Or it could be wrong. ;)

Cheers

Phil Hobbs

I think kovar is magnetic, perhaps that would make a difference, at least at some frequencies.

I've seen butterfly package lasers with a long wirebond from the pin to the laser chip, and some with a ceramic transmission line ramp sloping down to the chip.

TL or just and SMD link?

RL

. . . any increase in permeability in the neighborhood could be expected to make things worse, not better.

RL

Depends on the frequency. Up at UHF the skin depth in the kovar will be zilch, and the permeability will be pretty small anyway--it goes to 1.0 around 500 MHz for most iron/nickel alloys AFAICT.

A quick search didn't turn up anything more recent than this:

Cheers

Phil Hobbs