copperhead

Research

The top of the report's first page: its title and author line over a figure of board D as openEMS meshes it, beside its receiver waveforms.
Simulation·

Simulating serpentine length matching on a bent differential pair

A post on X showed a U-bend skewing a differential pair by 9.5 ps and a serpentine putting it right. I had Copperhead build the bend and six ways of fixing it and solve every one in openEMS. Matching the lengths exactly removed only 44 to 75 % of the skew.

Animesh Chouhan14 min read
The top of the report's first page: its title and author line over a figure of board D as openEMS meshes it, beside its receiver waveforms.
Simulation·

Simulating serpentine length matching on a bent differential pair

A post on X showed a U-bend skewing a differential pair by 9.5 ps and a serpentine putting it right. I had Copperhead build the bend and six ways of fixing it and solve every one in openEMS. Matching the lengths exactly removed only 44 to 75 % of the skew.

Animesh Chouhan14 min read
The top of the copperbench whitepaper's first page: its title, author line, date and the start of the abstract.
Method·

copperbench: Can language models edit real hardware designs?

copperbench is a benchmark for language-model agents on verified hardware design edits: real KiCad boards, electrical verification as the oracle and cost reported alongside pass rate.

Animesh Chouhan15 min read