LCR Tester Design with USB-C

flux

Work done
  • Rebuilt the AFE power/reference and created fresh excitation/measurement nets via explicit rewiring:
    • ^GND, ^3V3, ^AVDD, ^VREF2V5 using U7 and IC1
    • Excitation: U12 ^DDS_OUT -> U13 buffer, with FORCE drive staging through R11/R12
    • Kelvin protection nets on U15: ^FORCE_P/^FORCE_N/^SENSE_P/^SENSE_N
    • ADC filter entry nets: ^ADC_AIN0_FILT/^ADC_AIN1_FILT into U4 via R17/R18
    • VCM bias net: ^VCM_1V65 using divider R15/R16 and caps C18/C19
  • Implemented DDS SPI wiring U12 -> U3: FSYNC/SCLK/SDATA.
  • Attempted to correct an incorrect merge of ADS1120 AIN0/REFP1 with the reference rail by moving it to ^ADC_AIN0_FILT.
Success criteria review
  • ❌ Netlist remains unstable: a legacy/unnamed net (reported as MEAS_NODE_B / unnamed net) repeatedly re-merges power (3V3/DVDD), sensing, and measurement nodes despite explicit disconnect/connect operations, preventing completion of FORCE/SENSE routing, calibration OPEN/SHORT/LOAD wiring, and clean ERC.
  • ❌ ERC/DRC clean: DRC airwires and missing project documentation remain; ERC also becomes unreliable due to the net merge.
  • ✅ DDS SPI connectivity between U12 and U3 is in place.
Next steps
  • This project needs a manual schematic cleanup step to remove the legacy net portals/labels that keep re-introducing MEAS_NODE_A/B (and any duplicated power portals), then I can re-run the wiring cleanly.
  • After that, run Auto-Layout (I cannot route) to clear DRC airwires, and add a project document to clear the documentation DRC.
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  • Generic Inductor
    Generic Inductor
    A generic fixed inductor suitable for rapid circuit topology development. The footprint automatically adapts based on the selected package, supporting standard SMD sizes (e.g., 0402, 0603, 0805) as well as well-known inductor packages such as SDR1806, PA4320, SRN6028, and SRR1260. Standard inductor values: 1.0 nH, 10 nH, 100 nH, 1.0 µH, 10 µH, 100 µH, 1.0 mH 1.2 nH, 12 nH, 120 nH, 1.2 µH, 12 µH, 120 µH, 1.2 mH 1.5 nH, 15 nH, 150 nH, 1.5 µH, 15 µH, 150 µH, 1.5 mH 1.8 nH, 18 nH, 180 nH, 1.8 µH, 18 µH, 180 µH, 1.8 mH 2.2 nH, 22 nH, 220 nH, 2.2 µH, 22 µH, 220 µH, 2.2 mH 2.7 nH, 27 nH, 270 nH, 2.7 µH, 27 µH, 270 µH, 2.7 mH 3.3 nH, 33 nH, 330 nH, 3.3 µH, 33 µH, 330 µH, 3.3 mH 3.9 nH, 39 nH, 390 nH, 3.9 µH, 39 µH, 390 µH, 3.9 mH 4.7 nH, 47 nH, 470 nH, 4.7 µH, 47 µH, 470 µH, 4.7 mH 5.6 nH, 56 nH, 560 nH, 5.6 µH, 56 µH, 560 µH, 5.6 mH 6.8 nH, 68 nH, 680 nH, 6.8 µH, 68 µH, 680 µH, 6.8 mH 8.2 nH, 82 nH, 820 nH, 8.2 µH, 82 µH, 820 µH, 8.2 mH #generics #CommonPartsLibrary
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Worthy Rose Robot Vacuum b723 thumbnail
Worthy Rose Robot Vacuum - High Precision LCR Tester

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