A CMOS transimpedance amplifier with high gain and wide dynamic range for optical fiber sensing system

Abstract

For the optical fiber sensing applications, a new CMOS transimpedance amplifier (TIA) with high gain and wide dynamic range has been designed based 0.18μm CMOS process. The TIA proposed consists of three-stage cascade push pull inverter, inductive-series peaking, automatic gain control (AGC) circuit, signal to differential circuit, and output buffer. Three-stage cascade push pull inverter is used to achieve enough high gain. The inductive-series peaking technique is employed in this design to extend further the bandwidth. Automatic gain control circuit is used to realize wide dynamic range. In order to reduce the signal reflection, output buffer is added in this design. Owing to the signal output of three-stage cascade push pull inverter and the differential inputs of output buffer, Single to differential circuit must be set in the design to complete the matching.