Two-stage Cascode Class-AB RF power amplifier: Placement & Routing

Placement of GaN on SiC 2 stage RF AMP

original , fixed (hardcoded), SA 1, QP, QP+SA (MNA, Small WireLen, non 0 viol.), 

• QP+SA with adaptive cooling schedule (2.55 WireLen, usual. 0 viol.) 
• add congestion penalty in energy (track overflow significantly reduced,  Bench, Overflow Comp, viz, detail viz)

QP+ILP+PrePass (No A* or SA, viol.) comparison with ACS  detail

Slides fit of SA for RF PA Layout

 Two-stage Cascode Class-AB RF power amplifier targeting 5G n78 (3.5 GHz) in TSMC 28nm RF

Placement (refinement of add congestion penalty in energy)

change log

Placement (refinement of add congestion penalty in energy)

change log

benchmark

pipeline of placement process (comparison with ePlace, RePlAce)

生活比喻

把 v1 → v2 → v3 → v4 想成搬家時估算紙箱會不會塞進車子：

• v1：「我目測一下，差不多吧。」（純 HPWL）
• v2：「我量了紙箱長寬高，假設車子是大箱型車。」（bbox + 理想層假設）
• v3：「結果今天租到一台小轎車，紙箱根本塞不下，後座壓壞了。」（沒有頂層金屬，IR 爆炸）
• v4：「換成原本以為的箱型車，順利搞定。」（四層金屬，回到合理狀態）

EM-Aware

EM-Aware Placer

EM × λ-Aware Placer (dev log) v2

Routing added -v3

EM × λ-Aware Placer + Pathfinder  v3

remove phantoms and reweigh EM viol leveraging router/pathfinder v3+, roadmap

benchmark (phantoms-exit)

catastrophic 

v4 with MT, benchmark, roadmap

v4+ with pair swap