Patent ID: 6577655
Filing Date: 2003-06-10
Classification: G11B,H01S,H04B

Abstract:
A control circuit for a radiation source comprising:means for generating an error signal (Perr) which is indicative for a difference between a measured average value (Pmeas) of the output power of the radiation source and a desired average value (Pset) of the output power of the radiation source, combining means for combining said error signal (Perr) and an information signal (Sin) for modulating the radiation source, said combining means generating a control signal (Sout) for the radiation source in response to the combination of said error signal (Perr) and said information signal (Sin) for modulating the radiation source, wherein the combining means comprise: first means for modifying the information signal (Sin) by a multiplicative factor &ggr; which is dependent on the error signal (Perr) and second means for modifying the information signal (Sin) by an additive factor &sgr; which is dependent on the error signal (Perr).