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Feedback methods for inductorless bandwidth extension and linearisation of post-amplifiers in optical receiver frontends

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Feedback methods for inductorless bandwidth extension and linearisation of post-amplifiers in optical receiver frontends

Chan, Marc-Alexandre (2018) Feedback methods for inductorless bandwidth extension and linearisation of post-amplifiers in optical receiver frontends. Masters thesis, Concordia University.

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Abstract

Optical communication is increasingly important in today's telecommunications. It is not only a key component in long-haul infrastructure, but is also being brought into new applications within the datacentre, at the circuit board and integrated circuit level, and in next generation mobile networks. This thesis proposes feedback tuning approaches in order to address two challenges within optical receiver analog frontend circuits: a) the dynamic response of a prior bandwidth extension technique; and b) linearity optimisation.

To address dynamic response, we begin with an inductorless method of bandwidth extension using positive feedback loops. In a multi-stage post-amplifier with local positive feedback loops, we propose an approach which tunes each positive feedback gain separately, and demonstrate that this achieves better dynamic response and eye opening than the prior equal-feedback-gain approach. We additionally propose root-locus analysis as a means of characterising dynamic response, and suggest some design guidelines based on this analysis.

To address linearity optimisation, we propose the use of an interleaving negative-feedback post-amplifier topology, previously proposed only for bandwidth extension. We investigate the relationship between the feedback gains and linearity and develop a design approach for linearity optimisation. We then designed and fabricated two 70 dB 6 GHz optical receiver circuits, making use of two different post-amplifiers, in order to compare different design approaches. We achieved a linearity of 0.08 dBVrms OIP3 (quasi-static) and a THD of 0.195\% at 1 GHz.

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Electrical and Computer Engineering
Item Type:Thesis (Masters)
Authors:Chan, Marc-Alexandre
Institution:Concordia University
Degree Name:M.A. Sc.
Program:Electrical and Computer Engineering
Date:September 2018
Thesis Supervisor(s):Cowan, Glenn
ID Code:984441
Deposited By: MARC-ALEXANDRE CHAN
Deposited On:16 Nov 2018 15:59
Last Modified:16 Nov 2018 15:59
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