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20 Gb/s Dual-Mode SST VCSEL Driver | IEEE Conference Publication | IEEE Xplore

20 Gb/s Dual-Mode SST VCSEL Driver


Abstract:

This work presents simulation results of a CMOS 1.2-V single-ended source-series-terminated (SST) voltage-mode electrical link driver in a 65 nm technology. The driver op...Show More

Abstract:

This work presents simulation results of a CMOS 1.2-V single-ended source-series-terminated (SST) voltage-mode electrical link driver in a 65 nm technology. The driver operates in two driving modes. The first mode uses symmetric pre-emphasis feedforward equalization to drive a short electrical link which introduces a total loss of 16 dB including electro-static discharge (ESD) and wire bonding losses at 10 GHz. The second mode drives a VCSEL diode through an electrical link exploiting asymmetric equalization. Through simulation, this dual-mode proposed driver operates up to 20 Gb/s and is estimated to dissipate 40 mW of power.
Date of Conference: 09-11 August 2021
Date Added to IEEE Xplore: 13 September 2021
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Conference Location: Lansing, MI, USA

I. Introduction

In conventional computer systems such as in data centers, the electrical switch chip is flip-chip bonded to a chip carrier. The laser diode driver (LDD) and the VCSEL are on another chip carrier connected via short wire-bonds [3]. A printed circuit board (PCB) transmission line connects the data-producing chip to the laser diode driver as shown in Fig. 1(a). To reduce power dissipation, the stand-alone LDD can be embedded with the switch in the proposed design as suggested in Fig. 2(b). Accordingly, the VCSEL can be driven using a voltage-mode-logic-based (VML) transmitter. Therefore, designing a modified circuit that can drive either a VCSEL through an electrical link, or an electrical link can be a feasible solution to reduce the power consumption and the overall cost of the transmitter, as there will be one circuit that can do both functions instead of separate circuits for each function.

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