CMOS adaptive TIA with embedded single-ended to differential conversion for analog optical links

Author

Ahmad, Waqas ; Abdulaziz, Mohammed ; Tormanen, Markus ; Sjoland, Henrik

Author_Institution

Dept. of Electr. & Inf. Technol. (EIT), Lund Univ., Lund, Sweden

fYear

2015

fDate

24-27 May 2015

Firstpage

658

Lastpage

661

Abstract

A variable gain transimpedance amplifier (TIA) is presented featuring single-ended to differential conversion by means of negative feedback. The proposed topology also ensures stability when amplifier gain is varied. Furthermore, effective input capacitance of the TIA is reduced by using a positive capacitive feedback. The circuit is intended for intermediate frequency (IF) over fiber systems, but can be readily adapted for other applications. When simulated with a photodiode capacitance of 1.4 pF, the TIA exhibits a tunable gain range of 51 to 73dBΩ with a bandwidth of 550 MHz. The circuit designed in a standard 65nm CMOS process consuming 4mA from a 1.2V supply, achieves a spurious free dynamic range (SFDR) of 109dB·Hz^2/3 at 100 MHz.

Keywords

CMOS integrated circuits; circuit feedback; intermediate-frequency amplifiers; operational amplifiers; optical links; photodiodes; CMOS adaptive TIA; IF; SFDR; analog optical link; bandwidth 550 MHz; capacitance 1.4 pF; complementary metal oxide semiconductor; current 4 mA; embedded single-ended-to-differential conversion; fiber system; intermediate frequency; negative feedback; photodiode capacitance; positive capacitive feedback; size 65 nm; spurious free dynamic range; variable gain transimpedance amplifier; voltage 1.2 V; Bandwidth; Capacitance; Frequency response; Gain; Optical fiber communication; Photodiodes; Radio frequency;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems (ISCAS), 2015 IEEE International Symposium on

Conference_Location

Lisbon

Type

conf

DOI

10.1109/ISCAS.2015.7168719

Filename

7168719