Chamber Software

Chamber software is the recipe-execution layer running on an individual process chamber's controller — the code that turns a recipe's stored setpoints (gas flows, RF power, pressure, temperature, timed steps) into the actual sequence of hardware commands that runs a wafer through a process step. Chamber mount/docking gets the chamber physically connected to the mainframe; chamber software is what makes it capable of actually processing a wafer once it's there.

Recipe selected
By lot/product ID from host system
Chamber software executionOne pass per wafer, step by step through the recipe
Setpoint load
Gas flows, RF power, pressure, temp targets
Step execution + closed-loop control
MFC/RF/pressure servo loops hold setpoints
Endpoint / step-time check
OES, interferometry, or fixed timer
↻ next step
Recipe complete
Pump-down, wafer ready for handoff to MF robot
Fault / out-of-spec
Abort recipe, alarm, hold wafer in chamber

Most of the code is closed-loop control, not sequencing. A recipe step doesn't just command "RF power = 800W" once; chamber software runs continuous feedback loops that measure actual RF-delivered power, compare it to setpoint, and adjust the match network dozens of times per second to hold it there — the same pattern repeats for gas flow (MFC loops), pressure (throttle-valve loops), and temperature (heater loops). The recipe file is really a list of targets; chamber software is the control system that actually hits them.

Chamber Software — Recipe to Closed-Loop Control a recipe step becomes several simultaneous feedback loops Recipe step RF: 800 W Pressure: 40 mT Gas: 120 sccm Temp: 60°C Time: 45 s RF power loop — set vs. measured, match-network retune MFC flow loop — gas setpoint vs. actual flow Pressure loop — throttle valve servo Endpoint check OES / interferometry or fixed step timer → advances recipe all three loops run concurrently, every recipe step, for every wafer

It's also the fastest place a wafer gets scrapped if something's wrong. If a closed-loop target can't be held — a clogged MFC, a drifting match network, a leaking seal — chamber software is positioned to catch the out-of-spec condition in real time and abort the recipe before the wafer finishes a bad step, rather than letting a bad wafer run to completion and get caught later by metrology. That real-time fault response is a large part of why chamber software reliability is treated as seriously as the hardware itself.

Chamber software is the layer that makes a mounted, docked chamber actually do the job it was built for — it's invisible when everything holds setpoint, and it's the first thing engineers pull logs from when a wafer comes out wrong.

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