Novel broadband analog predistortion circuit for radio-over-fiber systems

Author

Ran Zhu ; Zichen Xuan ; Ye Zhang ; Xiupu Zhang ; Dongya Shen

Author_Institution

Dept. of Electr. & Comput. Eng., Concordia Univ., Montreal, QC, Canada

fYear

2015

fDate

17-22 May 2015

Firstpage

1

Lastpage

4

Abstract

A novel broadband analog predistortion circuit (PDC) is designed to linearize radio-over-fiber (RoF) systems. Dual Schottky diode is used as predistorter. The PDC with high bandwidth and small dimension is achieved by removing quarter-wavelength transformers and power dividers. Measured S-parameters show that the PDC can work from 10 MHz to up to 40 GHz. The PDC is verified using two-tone and WiFi signals in an RoF system. The spur-free dynamic range with respect to third order intermodulation distortion is improved by more than 10 dB from 1 to 5 GHz and more than 5 dB from 1 to 30 GHz, and it is found that the RoF system is limited by fifth order nonlinearity. Error vector magnitude is improved by 1 dB for WiFi signals at 2.4 and 5 GHz by using the PDC.

Keywords

analogue circuits; intermodulation distortion; microwave circuits; microwave photonics; millimetre wave circuits; radio-over-fibre; PDC; RoF system; WiFi signals; broadband analog predistortion circuit; dual Schottky diode; error vector magnitude improvement; fifth order nonlinearity; frequency 1 GHz to 30 GHz; frequency 1 GHz to 5 GHz; microwave photonics; radio-over-fiber system linearization; spur-free dynamic range; third order intermodulation distortion; two-tone signals; Distortion measurement; Frequency measurement; Frequency modulation; Indium tin oxide; Radio frequency; Signal generators; Wireless communication; Microwave photonics; broadband analog predistortion circuit; radio-over-fiber systems;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium (IMS), 2015 IEEE MTT-S International

Conference_Location

Phoenix, AZ

Type

conf

DOI

10.1109/MWSYM.2015.7166862

Filename

7166862