Realization of a tunable analog predistorter using parallel combination technique for laser driver applications  

作　　者：宋奇伟 Mao Luhong Xie Sheng Zhang Shilin 

机构地区：[1]School of Electronic Information Engineering,Tianjin University

出　　处：《High Technology Letters》2015年第1期90-95,共6页高技术通讯（英文版）

基　　金：Supported by the National Natural Science Foundation of China(No.61036002)

摘　　要：This paper describes a new approach for designing analog predistorters that can compensate for the nonlinear distortion of laser drivers in a radio-over-fiber （RoF） system. In contrast to previous works, this paper analyzes the transfer characteristics of CMOS transistors, by combining parallel currents of CMOS transistors in various W/L and negative bias voltages to realize the tunable analog predistortion function. The circuit is fabricated by a standard 0.18txm CMOS technology. The core circuit current consumption is only 15mA and the entire driver circuit works in a band-pass from 1 - 2.2GHz. Experimental results of two-tone tests have shown that with an analog predistortoer the IIP3 of the laser driver circuit has an improvement of 4.91 dB.This paper describes a new approach for designing analog predistorters that can compensate for the nonlinear distortion of laser drivers in a radio-over-fiber(RoF) system.In contrast to previous works,this paper analyzes the transfer characteristics of CMOS transistors,by combining parallel currents of CMOS transistors in various W/L and negative bias voltages to realize the tunable analog predistortion function.The circuit is fabricated by a standard 0.18μm CMOS technology.The core circuit current consumption is only 15 mA and the entire driver circuit works in a band-pass from 1 ~2.2GHz.Experimental results of two-tone tests have shown that with an analog predistortoer the IIP3 of the laser driver circuit has an improvement of 4.91 dB.

关 键 词：radio-over-fiber （RoF） nonlinear analog predistorter parallel combination MOS transistor 

分 类 号：TN32[电子电信—物理电子学]