HMC799 is a fast transimpedance amplifier in QFN-16 package.
This is how the One Inch Photodetector looks like mounted in a 1" lens mount.
Bandpass filter, in a fairly large HQ1157 footprint.
This might be useful for buffering the output of photodiode amplifiers?
One-Inch-Photodetector (https://github.com/aewallin/One-Inch-Photodetector) with 1 MOhm transimpedance, a larger Hamamatsu 5791 photodiode, and OPA657 op-amp.
Achieves around 4 MHz bandwidth, which should be OK for intensity monitoring etc. This will work only for quite small powers, since the maximum DC output swing is 5V, corresponding to a 5 uA photocurrent, or around 12 uW if we assume 0.4 A/W responsivity for the photodiode.
Again I needed to tweak the TIASim simulation to make the experimental data fit the model. I now suspect this is due to capacitive loading of the op-amp output. This should be possible to test by connecting the detector directly to the Spectrum Analyzer input, and then adding successively longer cables and seeing if the response changes.
A simple SFP loopback board that loops back any received signal on the SFP RX-pins to the TX-pins. There's a voltage divider probing the signals, and an ONET1191P limiting amplifier provides amplified differential outputs, for probing the signal going through the SFP.
Designed in 2018, but only now uploaded to github, a simple SFP breakout board for playing around with SFP or SFP+ transcievers.
In contrast to earlier boards, this one has no op-amps or transformers on the TX/RX lines, and bandwidth seems to be good enough for 1Gbit/s at least.