A 2.4-$hbox{V} _{rm pp}$ 60-Gb/s CMOS Driver With Digitally Variable Amplitude and Pre-Emphasis Control at Multiple Peaking Frequencies

Aroca R. A.; Schvan P.; Voinigescu S. P.

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A 2.4-$hbox{V} _{rm pp}$ 60-Gb/s CMOS Driver With Digitally Variable Amplitude and Pre-Emphasis Control at Multiple Peaking Frequencies

机译：A 2.4-$hbox{V} _{rm pp}$ 60-Gb/s CMOS Driver With Digitally Variable Amplitude and Pre-Emphasis Control at Multiple Peaking Frequencies

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摘要

The design of a 60-Gb/s CMOS driver with input signal retiming is analyzed theoretically and validated experimentally. The output stage employs a modified distributed amplifier (DA) architecture with summation of both low-pass and reactively coupled bandpass signal paths along a 50- $Omega$ output transmission line. The DA features digital variable gain amplifier (DVGA) cells to achieve broadband waveshape control with adjustable pre-emphasis at three different peaking frequencies. Binary-weighted MOSFET gate-finger groupings are employed in a Gilbert-cell based DVGA topology to minimize bit-dependent output impedance and group delay variations. ${S}$ -parameter measurements of the retimed driver show 54-dB gain, while the standalone DA exhibits approximately 10 dB of peaking control in each of the three frequency bands. Input and output return loss is better than $-{hbox {10 dB}}$ up to 60 GHz. The circuit operates from 1.2- and 2-V supplies and achieves a throughput efficiency of 12.2 mW/Gb/s. Equalization experiments at 40 Gb/s demonstrate compensation of various channel characteristics, including over 12 feet of cascaded coaxial cables with 21 dB loss at 20 GHz.

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来源
《IEEE Journal of Solid-State Circuits》 |2011年第10期|2226-2239|共14页
作者
Aroca R. A.; Schvan P.; Voinigescu S. P.;
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作者单位

Edward S. Rogers, Sr. Department of Electrical and Computer Engineering, University of Toronto, Toronto, Canada;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类
关键词
CMOS; digital control; distributed amplifier (DA); equalization; high-speed data communication; large-swing driver; pre-emphasis;

A 2.4-$hbox{V} _{rm pp}$ 60-Gb/s CMOS Driver With Digitally Variable Amplitude and Pre-Emphasis Control at Multiple Peaking Frequencies

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