Patent ID: 6953750

Claim:
A method for controlling a temperature of a surface of a belt pad in a linear chemical mechanical planarization (CMP) system, comprising: measuring a temperature of a surface of a belt pad at a series of points across the belt pad corresponding to nozzles of a slurry bar disposed above the surface of the belt pad; for each of the series of points, determining a first difference corresponding to a temperature difference between the measured temperature of the surface of the belt pad and a set temperature; for each of the series of points, conditioning the first difference with a first controller to obtain a first result; for each of the series of points, determining a second difference corresponding to a temperature difference between the first result and a slurry temperature from a heated slurry supply source corresponding to a nozzle of the slurry bar; for each of the series of points, conditioning the second difference with a second controller to obtain a second result; and for each of the series of points, using the second result to adjust a slurry temperature in the heated slurry supply source.