Patent ID: 8541727

Claim:
A gain control circuit to control strength of signals received from an array of photo-detectors in an optical navigation sensor, the gain control circuit comprising: a number of transimpedance-amplifiers (TIAs) each including an input coupled to an output of at least one photo-detector (PD) in the array to receive a current signal therefrom and to generate an automatic gain control (AGC) signal in response thereto; and a controller coupled to outputs of the number of TIAs to receive the AGC signal therefrom, the controller including logic to execute a signal gain adjustment algorithm and to adjust a gain of a signal processor coupled to the array of PDs in response to the AGC signal, wherein the signal processor comprises a number of differential transimpedance-amplifiers (DIFF-TIAs) each including inputs coupled to the array of PDs to receive current signals therefrom and to output a voltage signal generated in response thereto.