It would be nice to give it a try.
Did you ever post a schematic? Google Groups has a few of your posts, but no references to a schematic. Any data such as risetime, amplitude, rep rate?
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5 years ago
phase shift in inverting opamp
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5 years ago
It was a customer gig, so they own the work product. In general terms, it was a single-diode sampler with pHEMT switches driven by LVDS line receivers (as recommended by JL). The FWHM was about 100-150 ps depending on the version, and eventually the position uncertainty was a small fraction of an inch.
Those aren't SOTA numbers except that the BOM cost for my bit was only about $2 +- 40 cents, depending on the version--the pHEMTs were more expensive than the SiGe BJT alternatives but switched faster. IIRC Chester & Co cleaned up the impulse response of the transducer enough that they could get excellent results with cheaper transistors, but I haven't seen the final result.
A fun gig, for sure.
Cheers
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
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5 years ago
Thanks. Very interesting.