Research on Transimpedance Amplifier based on Inductive Peaking Technology

【Objective】With the rapid growth of transmission rates in optical communication technology, low-power, miniaturized, and wide bandwidth optical amplifiers are key factors affecting high-speed optical communication. In this paper, a wide bandwidth Transimpedance Amplifier (TIA) applied in optical communication system is designed based on a low-cost 130 nm Complementary Metal Oxide Semiconductor (CMOS) process technology, which can achieve high-speed data transmission at 10 Gbit/s.【Methods】The parasitic capacitance of a photodetector can produce a principal pole in the system transfer function, which can adversely affect the bandwidth and noise performance. In order to break this limitation, this paper designs an optical amplification circuit based on active feedback structure in combination with inductive peaking technique. The circuit is supplied with a voltage of 1.3 V. A conventional common source and gate structure is improved as the input stage to isolate the effect of input parasitic capacitance on bandwidth, and a small signal equivalent model is developed to analyze the transfer function of the circuit. The structure reduces the input impedance and further extends the bandwidth using active feedback and inductive peaking techniques. The amplifier circuit is supplied with precise, stable and temperature-independent bias voltage by the Bandgap Reference (BGR), which ensures the optimal operating point of the transistor to enhance the stability of the system. To verify the reliability of the structure, the circuit is designed and simulated using the Spectre tool of Cadence software.【Results】The simulation results show that when the input parasitic capacitance takes the classical value of 0.25 pF, the -3 dB bandwidth of the structure can reach 9.23 GHz, and the power consumption is only 23.5 mW. Moreover, the equivalent input current noise is lower than<inline-graphic specific-use="print" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="media/1005-8788-2025-03-240088-I002.jpg"/><inline-graphic specific-use="big" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="alternativeImage/1005-8788-2025-03-240088-I002.jpg"/><inline-graphic specific-use="small" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="alternativeImage/1005-8788-2025-03-240088-I002c.jpg"/>, and the eye diagram of the signals with a transmission rate of 10 Gbit/s has less jitter with good vertical eye-opening performance.【Conclusion】The results indicate that the signal transmission effect of TIA is good, and the design can meet the design requirements of optical receiver with 10 Gbit/s transmission rate, which is of great reference value in the field of high-speed optical communication integrated circuits.