Bandwidth Tripler: Broadband Signal Generation With an Image-Rejection Analog Multiplexer for Fiber Optic Transmitters

This article describes a frequency-interleaved digital-to-analog conversion technique named bandwidth tripler with an image-rejection analog multiplexer (AMUX). The tripler extends the bandwidth of the parallelized sub-digital-to-analog converters (DACs) by three times in the frequency domain. Image...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2023-01, Vol.71 (1), p.22-34
Main Authors: Kawahara, Keisuke, Sawada, Joe, Kamo, Takumi, Umeda, Yohtaro, Takano, Kyoya, Hara, Shinsuke
Format: Article
Language:English
Subjects:
Analog circuits
Analog multiplexer (AMUX)
Analogue filters
Bandwidth
Bandwidths
Broadband
Clocks
CMOS
Digital imaging
Digital to analog conversion
Digital to analog converters
digital-to-analog converter (DAC)
Fiber optics
fiber-optic communication
integrated circuit
interleaved DAC
Multiplexers
Multiplexing
Optical device fabrication
Optical distortion
Optical fibers
optical transmitter
Optical transmitters
Parameters
Power consumption
Rejection
Signal generation
Signal quality
Switches
Transmitters
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Summary:This article describes a frequency-interleaved digital-to-analog conversion technique named bandwidth tripler with an image-rejection analog multiplexer (AMUX). The tripler extends the bandwidth of the parallelized sub-digital-to-analog converters (DACs) by three times in the frequency domain. Image rejection using the phase-shifted method reduces analog filters for combining divided sub-bands, which improves the signal quality and size of the analog circuits. Besides, the tripler outputs no spurious signals out of the target bandwidth. The AMUX for the tripler was fabricated in 180-nm CMOS technology. Pseudo-differential switches were used to reduce distortion, and a broadband termination circuit was inserted at the output of the AMUX to compensate for the limited performance of the CMOS devices. The fabricated AMUX was evaluated by S-parameter and time-domain measurements. The S-parameter measurement results demonstrated a bandwidth of 23.4 GHz. In addition, broadband signal generation for 30 Gbps PAM4 was demonstrated without using any equalization. The power consumption of the AMUX was only 49 mW. This high-speed performance is comparable to the conventional DACs fabricated using advanced CMOS processes.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2022.3190480