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20–25 Gbit/s low-power inductor-less single-chip optical receiver and transmitter frontend in 28 nm digital CMOS

Published online by Cambridge University Press:  02 May 2017

László Szilágyi*
Affiliation:
Technische Universität Dresden, Chair for Circuit Design and Network Theory, 01069 Dresden, Germany
Guido Belfiore
Affiliation:
Technische Universität Dresden, Chair for Circuit Design and Network Theory, 01069 Dresden, Germany
Ronny Henker
Affiliation:
Technische Universität Dresden, Chair for Circuit Design and Network Theory, 01069 Dresden, Germany
Frank Ellinger
Affiliation:
Technische Universität Dresden, Chair for Circuit Design and Network Theory, 01069 Dresden, Germany
*
Corresponding author: L. Szilágyi Email: laszlo.szilagyi@tu-dresden.de

Abstract

The design of an analog frontend including a receiver amplifier (RX) and laser diode driver (LDD) for optical communication system is described. The RX consists of a transimpedance amplifier, a limiting amplifier, and an output buffer (BUF). An offset compensation and common-mode control circuit is designed using switched-capacitor technique to save chip area, provides continuous reduction of the offset in the RX. Active-peaking methods are used to enhance the bandwidth and gain. The very low gate-oxide breakdown voltage of transistors in deep sub-micron technologies is overcome in the LDD by implementing a topology which has the amplifier placed in a floating well. It comprises a level shifter, a pre-amplifier, and the driver stage. The single-chip frontend, fabricated in a 28 nm bulk-digital complementary metal–oxide–semiconductor (CMOS) process has a total active area of 0.003 mm2, is among the smallest optical frontends. Without the BUF, which consumes 8 mW from a separate supply, the RX power consumption is 21 mW, while the LDD consumes 32 mW. Small-signal gain and bandwidth are measured. A photo diode and laser diode are bonded to the chip on a test-printed circuit board. Electro-optical measurements show an error-free detection with a bit error rate of 10−12 at 20 Gbit/s of the RX at and a 25 Gbit/s transmission of the LDD.

Type
Research Papers
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2017 

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