A Transimpedance Amplifier (TIA) is an integrated circuit that converts a current signal to a voltage signal. It is commonly used in optical communication systems to convert the small current signal generated by a photodiode in response to light into a voltage signal that can be more easily processed. The TIA is typically placed immediately after the photodiode in the receiver circuit. TIA chips can have different bandwidths, gains, noise figures, and other performance characteristics depending on the specific application.