Title :
A 1.93 pA/√Hz transimpedance amplifier for 2.5 Gb/s optical communications
Author :
Shahdoost, Shahab ; Medi, Ali ; Saniei, Namdar
Author_Institution :
Dept. of Electr. Eng., Sharif Univ. of Technol., Tehran, Iran
Abstract :
A state-of-the-art low-noise transimpedance amplifier (TIA) for 2.5 Gb/s family is presented using IBM 0.13-μm CMOS technology. This TIA would be a pa rt of a homodyne detector in a quantum key distribution (QKD) system. In this work a thorough design methodology based on a novel analytical noise optimization is presented. Also a unique method for eliminating the DC current o f the input photodiodes (PDs) is proposed. The post-layout simulation results show bandwidth of 52 kHz to 1.9 GHz, average input referred noise of 1.93 pA/√(Hz), and transimpedance gain of 80 dbΩ while dissipating 12 mW from a 1.5 V power supply, including the output buffer.
Keywords :
CMOS analogue integrated circuits; homodyne detection; low noise amplifiers; operational amplifiers; optical communication; optimisation; photodiodes; quantum cryptography; DC current elimination; IBM CMOS technology; PD; QKD system; analytical noise optimization; average input referred noise; bandwidth 52 kHz to 1.9 GHz; bit rate 2.5 Gbit/s; homodyne detector; low-noise TIA; low-noise transimpedance amplifier; optical communication; photodiode; post-layout simulation; power 12 mW; quantum key distribution system; size 0.13 mum; transimpedance gain; voltage 1.5 V; CMOS integrated circuits; CMOS technology; Gain; Noise; Optical fiber amplifiers; Topology; Transistors;
Conference_Titel :
Circuits and Systems (ISCAS), 2011 IEEE International Symposium on
Conference_Location :
Rio de Janeiro
Print_ISBN :
978-1-4244-9473-6
Electronic_ISBN :
0271-4302
DOI :
10.1109/ISCAS.2011.5938235
