Title :
A 3 Gb/s 80 dB CMOS differential transimpedance amplifier for optical communication systems
Author :
Pongpalit, Wacharapol ; Kasemsuwan, Varakorn ; Ahn, Hyungkeun
Author_Institution :
Dept. of Electron., Mongkut´´s Inst. of Technol. Ladkrabang, Bangkok, Thailand
Abstract :
In this paper, a 3 Gbit/s 80 dB differential CMOS transimpedance amplifier is proposed. The shunt-shunt feedback configuration is used to compromise between the wide bandwidth of the low impedance design and the low noise performance of the high impedance design. The basic amplifier employs fT doubler and compensation capacitor techniques to enhance the bandwidth. The phantom zero introduced by the feedback network is used to position the pole in any desired region of the closed loop systems. HSPICE is used to verify the circuit performance with a standard 0.5 μm CMOS technology and supply voltage of 2.5 V. Simulation results demonstrate the gain and the speed of operation of 80 dB and 3 Gb/s respectively. The equivalent input noise current spectral density is found to be 7.8 pA/(Hz) at 1 GHz and the total power dissipation is 58.4 mW.
Keywords :
CMOS integrated circuits; closed loop systems; compensation; differential amplifiers; feedback amplifiers; integrated optoelectronics; optical communication equipment; optical fibre amplifiers; pole assignment; wideband amplifiers; 0.5 micron; 1 GHz; 2.5 V; 3 Gbit/s; 58.4 mW; CMOS transimpedance amplifier; circuit performance; closed loop systems; compensation capacitor; differential transimpedance amplifier; fT doubler; feedback network; high impedance design; low impedance design; low noise performance; optical communication systems; pole; shunt-shunt feedback configuration; Bandwidth; CMOS technology; Capacitors; Differential amplifiers; Impedance; Optical amplifiers; Optical feedback; Optical fiber communication; Optical noise; Semiconductor optical amplifiers;
Conference_Titel :
Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on
Print_ISBN :
0-7803-8834-8
DOI :
10.1109/ISCAS.2005.1464912
