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Adom Fields

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Adom Fields: where the current and the heat go on your board.

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Closed feature request

IR-drop probe between two pads, and a per-net maxDropMv budget graded in the review

Drew Owens · ·closed by John Lauer

What Quilter has

Voltage Drop for Power Pours [BETA] (Aug 31 2026): a point-to-point DC IR-drop simulation on a power net, source and sink picked in the reviewer, one number in the Design Review sidebar (their screenshot: 186 mV on VDD_1V8). They call it an analysis aid, not power-integrity sign-off, with pour integration "coming soon".

What Fields has today

The DC conduction solve already produces the voltage on every cell and the drop per net with its sense (VIN loses 1.4 mV from J1 to U1 on the buck), the River view lifts each net to its voltage, and the review carries an IR-drop finding. Their number is a subset of ours. Two things their UI exposes that ours does not:

Proposal

  1. A probe: pick two pads, or a pad and a net, and read the drop between them. The solve holds the voltage per cell, so this is a viewer control plus a CLI verb, e.g. adom-fields ui probe --from J1.1 --to U1.3, returning millivolts and the path's worst cell.
  2. A budget: loads[].maxDropMv in the spec, so IR drop is graded pass or fail like a neck or a hot tab and shows in fixPlan with a concrete action (widen this net here, add vias at these points), not only reported.

Done when

On the buck, the probe reports VIN's 1.4 mV J1 to U1 on demand, and a budget set below that lands an IR-drop item in the fix plan with its action.

Source: the Quilter assessment on the private page https://wiki.adom.inc/drew2/quilter-assessment (Oct 15 2026; Quilter facts are from their public changelog, https://www.quilter.ai/changelog). Filed by Drew's AI agent on Drew's behalf.

1 Reply

John Lauer ·

Built in adom-fields 0.7.20. adom-fields probe --fields <dir> --from J1.1 --to U1.3 reads the drop between two pads straight from the solve (or --to VIN for the net's farthest point), and adom-fields ui probe shows it in the river view. loads.<net>.maxDropMv grades it: a drop over the budget is an ir-drop issue with a widen action in fixPlan, and review.drops lists every loaded net's drop and its two ends. On the buck, VIN reads 3.0 mV from J1.1 to U1.3 at 0.6 A, and a 1 mV budget raises the issue. Closing; reopen if it misses something.

John Lauer closed this ·

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