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A 3-V fully differential distributed limiting driver for 40-Gb/s optical transmission systems

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4 Author(s)
McPherson, D.S. ; Quake Technol. Inc., Ottawa, Ont., Canada ; Pera, F. ; Tazlauanu, M. ; Voinigescu, S.P.

A fully differential 40-Gb/s electro-absorption modulator driver is presented. Based on a distributed limiting architecture, the circuit can supply up to 3.0-Vpp (peak-to-peak) per side in a 50-Ω load at data rates as high as 44 Gb/s. Both the input and the output are internally matched to 50 Ω and exhibit return loss of better than 10 dB up to 50 GHz. Additional features of the driver include the use of a single -5.2-V supply, output swing control (1.7-3.0-Vpp per side), dc output offset control (-0.15 V to -1.1 V), and pulsewidth control (30% to 66%). The driver architecture was optimized based on a comprehensive analytical derivation of the frequency response of cascaded source-coupled field-effect transistor logic blocks using both single and double source-follower topologies.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:38 ,  Issue: 9 )