I had to quit for the day after pulling 4 different laser current supplies and 3 different optical power meters off the shelf and having none of them work.

Two of the current supplies are internally jumpered for 220 V mains, and nobody has bothered to reset them to 110 V since we closed the lab in Italy 5 years ago and shipped their test gear over here.

@ThePhoton I would say "e-mail your test and I'll run it at whatever accuracy you need". Would take no more than minutes (since some hero made 64 channel PC controllable SMUs and everything is integrated into a PC system). But we're a public company now and in a competition market and stuff

@ThePhoton Apparently they do in Cornell:

is a few hundred millivolts "good enough" for reliable conversion to TTL with a very low threshold schmitt trigger?

lets say my photodiode signal out of the TIA, in worst case, is only 50-100mV p-p

lets also assume there is no likelihood of serious capacitive or inductive coupling (which is probably a lie)

I need the 50-100mV worst-case signal to be 0-3.3V from a highspeed comparator or similar but to me, those values seem too low.

@Asmyldof I think, I might need helpses with the Altium's board-level annotate.

Fuckin car... sitting at the highway with a broken turbo.. again... With two kids. .. loud kids....

wow Plas

that sucks

@Asmyldof Gonna be hard to email you the actual laser I want to test.

Also it would probably violate an NDA with the guys who made the laser

@Asmyldof "Some hero" is you?

Second try to get to the hotel, this time with the late father in laws Mercedes

omg.. turns out I have a 5.5Mhz signal not a 20Mhz signal

that means i can use much cheaper and slower op-amps yay

That reaction makes me nervous lol

@KyranF someone must have paid an awful lot attention in some design meeting

@PlasmaHH nah it's my fault for not being very precise when examining the source signal. I partially blame the conditions in which I had to test in and my shitty equipment, but since re-testing today and being more observant I have more accurate info to work with. I've lost a day or two trying to find/design useful circuits and select ICs for 20MHz signal extraction from a photodiode when I actually only needed to do ~5MHz signals

@ThePhoton maaaaaaybe