Patent ID: 8064300

Claim:
A semiconductor integrated circuit comprising: a servo control circuit which generates a servo control signal using a signal inputted from an optical pickup, wherein the servo control circuit includes an analog circuit which carries out analog signal processing of the signal inputted from the optical pickup and a digital circuit which carries out digital processing of an analog signal generated from the analog circuit, wherein the digital circuit includes an AD converter which converts the analog signal into a digital signal and a digital signal processing circuit which carries out digital signal processing of the digital signal, wherein the analog circuit includes a calibration circuit, a first offset adjustment circuit and a second offset adjustment circuit for carrying out an offset adjustment of the analog signal, wherein the calibration circuit generates a multi-bit code control signal by comparing a signal to be adjusted by the first offset adjustment circuit with a predetermined reference voltage, wherein the first offset adjustment circuit includes a DA converter which converts the multi-bit code control signal generated by the calibration circuit into an analog output signal which determines an offset adjustment value of the first offset adjustment circuit, and wherein an offset adjustment value of the second offset adjustment circuit is determined by an offset control signal which is generated from the digital signal processing by the digital signal processing circuit of the digital signal converted by the AD converter.