Patent ID: 8123860

Claim:
A gas distribution system for providing at least two gases to a processing chamber, comprising: a lid assembly and a manifold comprising a first isolated flow path and a second isolated flow path, wherein the first isolated flow path includes a first inlet channel and a first outlet in fluid communication with a first outlet channel having a diameter that radially expands towards a showerhead coupled to the lid assembly, and wherein the second isolated flow path includes a second inlet channel and a second outlet in fluid communication with a second outlet channel; a first high speed valve coupled to the manifold and in fluid communication with the first isolated flow path between the first inlet channel and the first outlet channel and a second high speed valve coupled to the manifold and in fluid communication with the second isolated flow path between the second inlet channel and the second outlet channel; and a valved exhaust system in communication with and at least partially synchronized with the operation of at least the first high speed valve, wherein the first high speed valve and second high speed valve have on and off periods of less than about 100 milliseconds and the first high speed valve and the second high speed valve are each configured to pulse a precursor gas, continually flow a purge gas or a carrier gas, or both.