PDLVDS-RX — photodiode LVDS receiver

Clean-room receiver for the Miniscope Zero optical uplink: Excelitas C30737LH Si APD → OPA657 TIA → LMH7220 comparator (LVDS out, DAC-set threshold) → ADN2813 CDR → STM32H723 + USB3300 USB-HS. Design target: 50 Mbps line rate, 8b/10b (40 Mbps payload); the paper's mode: 8 Mbps Manchester (16 Mbaud), as transmitted. LT3757 flyback APD bias 150–420 V. USB-C powered; verify on any laptop over USB, no FPGA attached.

Pass 64

2026-11-04 13:24 PST (2026-11-04T21:24:00Z UTC) · commit 28f0b1f (28f0b1f67920694147922fec8b7e514a7a908bd6)

ADOPTED

repairg healing on the NXT-escape board: 1 group connected — the heal curve is exhausted on this residue (68, 40, 17, 12, 1 across the last five heals); the remaining bridges are astar-proof in the current field and need forced geometry (ripup/hand bridges). A clean re-run (fr51) reproduced this state exactly: 35 unconnected nets

Nets fully routednot recorded
Pins failednot recorded
Clearance violations4
Unconnected nets35
Audit verdictFAIL

Routes — all copper layers and each layer

F.Cu
F.Cu — click the image to open the full-size SVG in a new tab.
F.Cu layerF.CuIn1.Cu layerIn1.CuIn2.Cu layerIn2.CuB.Cu layerB.Cu

F.Cu In1.Cu In2.Cu B.Cu

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Pass 64 — top

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Pass 64 — bottom

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