APPARATUS AND METHOD USING DIGITALLY CONTROLLED INTEGRATION FOR SIGNAL DETECTION WITH IMPROVED NOISE CHARACTERISTICS

摘要

A signal conditioning circuit reduces an interferrometric fiber optic gyro (IFOG) noise, the IFOG including a light source (10), Integrated Optics Chips (IOC) (30) and a coupler (20) to output an optical power signal corresponding to a rotation-induced phase shift in a fiber coil (40) of the IFOG. The signal conditioning circuit includes a photodiode (210) that converts the optical power signal to a corresponding electrical compensation signal and one or more switched integrators (220) that receive and process the electrical compensation signal by selectively switching between a plurality of modes of each one of the one or more switched integrators (220). A method of signal conditioning in the IFOG to reduce IFOG noise includes the steps of converting the optical power signal to a corresponding electrical compensation signal and selectively integrating a current of the electrical compensation signal using at least one switched integrator (220).