In this work, the design of a linear Mach-Zehnder modulator driver for coherent optical communications is presented. The design, based on transconductor-transimpedance closed-loop topologies, achieves very low distortion, opening the way to the use of complex modulation formats. The measured Total Harmonic Distortion (THD) for 1.5 V peak-to-peak differential (Vppd) output swing at 1 GHz is 0.85 %, with a -3 dB bandwidth of 33 GHz and a continuously-programmable gain ranging from 10 dB to 20 dB. The overall power consumption is 204 mW, with a single supply voltage of 2.4 V. The chip has been fabricated in 28 nm CMOS technology, demonstrating the feasibility of both high performances, greater integration, and lower costs.
An Extremely Linear, 33 GHz Bandwidth Mach-Zehnder Modulator Driver Based on Closed-Loop Topologies in 28nm CMOS
Cordioli N.;Castello R.;Manstretta D.
2024-01-01
Abstract
In this work, the design of a linear Mach-Zehnder modulator driver for coherent optical communications is presented. The design, based on transconductor-transimpedance closed-loop topologies, achieves very low distortion, opening the way to the use of complex modulation formats. The measured Total Harmonic Distortion (THD) for 1.5 V peak-to-peak differential (Vppd) output swing at 1 GHz is 0.85 %, with a -3 dB bandwidth of 33 GHz and a continuously-programmable gain ranging from 10 dB to 20 dB. The overall power consumption is 204 mW, with a single supply voltage of 2.4 V. The chip has been fabricated in 28 nm CMOS technology, demonstrating the feasibility of both high performances, greater integration, and lower costs.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
