docs(palace): compare electrostatic cmim against IHP PDK compact model#169
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docs(palace): compare electrostatic cmim against IHP PDK compact model#169vvahidd wants to merge 1 commit into
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Clarify what the electrostatic notebook simulates (plate-to-plate mutual capacitance), explain the Maxwell vs mutual capacitance-matrix conventions, and link the IHP cap_cmim SPICE model. Add a PDK compact-model reference cell (area+perimeter law from techParams) and compare Palace Cm[1,2] against it. Remove the parallel-plate analytical sections.
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Reworks the electrostatic capacitance notebook (
nbs/_palace_electrostatic) to make clear what it simulates and to compare against the IHP PDK model rather than a hand-rolled parallel-plate estimate.Changes
cmim, and explains the two capacitance-matrix conventions Palace writes:terminal-C.csv(Maxwell) vsterminal-Cm.csv(mutual/"SPICE"), withCm[1,2]being the device value.capacitors_mod.lib) and notescap_cmimis a 2-terminal area+perimeter model.techParams(caspec,cpspec,lwd), soC_pdkis authoritative rather than hand-tuned.Cm[1,2]against the PDK model value.Note
Running the notebook surfaces a large Palace-vs-PDK gap (~7×) that traces to a separate stack-modeling bug in
ihp-gdsfactory(the MIM dielectric + top plate are lumped into one SiO₂ level). Tracked upstream in gdsfactory/IHP#188 — out of scope for this docs PR.