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 154

2026-11-06 05:42 PST (2026-11-06T13:42:46Z UTC) · commit d0ec1b1 (d0ec1b1139cb17656ce46add3a9534842dcf2c40)

ADOPTED

GND C29.2 unsealed: relayed the HV_R29M via 1.5 mm north (22.375,0.375 -> 22.375,1.875; F and B chain segments re-laid on the same vertical, DRC-neutral) to open the east corridor its 1.0 mm HV clearance shadow had closed by 0.01 mm, then grid-routed GND C29.2 -> R24.2 on F with pad-anchored ends. KiCad DRC vs exp183: violations 156 -> 156, unconnected items 55 -> 54 (GND items 5 -> 4; remaining GND is the four F-zone islands X2.2/C16.2/U6.51/U6.38). No clearance/shorting/dangling items.

Nets fully routednot recorded
Pins failednot recorded
Clearance violations70
Unconnected nets39
Audit verdictFAIL

Routes — all copper layers and each layer

All layers
All layers — click the image to open the full-size SVG in a new tab.
All layersAll layers 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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