#ir drop

🔸 What is Static IR Drop? Static IR drop refers to: 👉 Voltage drop in the power grid due to average (DC) current consumption Unlike dynamic analysis: No time-varying switching No waveform-based behavior 👉 Each cell is assumed to draw a constant current 💡 Fundamental Relation Voltage drop is governed by: 👉 V = I × R Where: I → Average current drawn by cells R → Resistance of PG grid 🔸…

🔸 Why Power Gating Matters As technology scales into deep submicron nodes, power is no longer dominated only by switching activity. 👉 Leakage power has become a critical challenge In modern designs: Leakage increases exponentially with lower threshold voltages Even when blocks are idle, they continue to consume power As discussed in low-power methodologies, leakage in advanced nodes can…

🔸 Why PG Grid Design Matters In the previous post, we saw that PDN is the backbone of a chip. At the heart of PDN lies the Power Grid (PG Grid) — the on-chip network responsible for delivering power to every standard cell. 👉 A weak PG grid leads to: IR drop failures Electromigration issues Performance degradation 👉 A strong PG grid ensures: Stable voltage Reliable operation Timing…