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40-Gb/s 2:1 multiplexer and 1:2 demultiplexer in 120-nm standard CMOS

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5 Author(s)
Kehrer, D. ; Infincon Technol. AG, Munich, Germany ; Wohlmuth, H.-D. ; Knapp, H. ; Wurzer, M.
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We present an integrated 2:1 multiplexer and a companion 1:2 demultiplexer in CMOS. Both integrated circuits (ICs) operate up to a bit rate of 40 Gb/s. The 2:1 multiplexer features two in-phase data inputs which are achieved by a master-slave flip-flop and a master-slave-master flip-flop. Current-mode logic is used because of the higher speed compared to static CMOS and the robustness against common-mode disturbances. The multiplexer uses no output buffer and directly drives the 50-Ω environment. An inductance connected in series to the output in combination with shunt peaking is used to enhance the bandwidth of the multiplexer. Fully symmetric on-chip inductors are used for peaking. The inductors are mutually coupled to save chip area. Lumped equivalent models of both peaking inductors allow optimization of the circuit. The ICs are fabricated in a 120-nm standard CMOS technology and use 1.5-V supply voltage. Measured eye diagrams of both ICs demonstrate their performance.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:38 ,  Issue: 11 )

Date of Publication:

Nov. 2003

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