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 22

2026-11-04 06:49 PST (2026-11-04T14:49:45Z UTC) · commit 910b627 (910b627e8b2880ce53ad1c11d1dd4c890869d59b)

ADOPTED

repair6 healing run on the cluster-cleared board, final state: unconnected nets 38 -> 35; -VA, SET_A and ULPI_D1 healed outright, the U7-clearing victims partially reconnected; a final sweep connected 0 and the run stopped. Residue is now almost entirely pad-ring clusters (U4, U13, U10, U9, U7 rows) plus D1.4/D1.5, J1.A9, U11.14 and GND islands — cluster clearing is the next tool for each

Nets fully routednot recorded
Pins failednot recorded
Clearance violations13
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

Top

Pass 22 — top

Bottom

Pass 22 — bottom

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