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.
