16-QAM

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A 1.54-pJ/b 64-Gb/s 16-QAM Intradyne Coherent Optical Receiver in 28-nm CMOS

A 1.54-pJ/b 64-Gb/s 16-QAM Intradyne Coherent Optical Receiver in 28-nm CMOS 150 150
Author(s): Ahmed E. Abdelrahman, Mohamed Badr Younis, Mohamed Osama Selim, Mohamed Saad Aly, Mahmoud A. Khalil, Pavan Kumar Hanumolu

Abstract:

The rapid growth of data-intensive applications in modern data centers is driving demand for scalable, high-speed, and energy-efficient optical interconnects. Traditional noncoherent modulation schemes, such as pulse amplitude modulation (PAM), are reaching their scalability limits at higher data rates, making coherent detection increasingly attractive due to its higher spectral efficiency. …

Published in: IEEE Journal of Solid-State Circuits
Page(s): 20 – 32
Year of Publication: 2026
Electronic ISSN: 1558-173X
DOI: 10.1109/JSSC.2025.3635729
Publisher: IEEE

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A 129–146-GHz Direct-Digital Modulation FinFET Transmitter With On-Chip Mismatch Calibrations for Beyond-5G Wireless Communications

A 129–146-GHz Direct-Digital Modulation FinFET Transmitter With On-Chip Mismatch Calibrations for Beyond-5G Wireless Communications 150 150
Author(s): Runzhou Chen, Hao-Yu Chien, Boxun Yan, Chao-Jen Tien, Mau-Chung Frank Chang

Abstract:

This article presents a D-band direct-digital modulation (DDM) transmitter with on-chip digital calibration blocks for future beyond-5G (B5G) wireless communication. The proposed DDM architecture mitigates the need for complex intermediate frequency (IF) generation and power-hungry digital-to-analog converters (DACs). The transmitter is implemented primarily in TSMC’s 16-nm p-FinFETs, …

Published in: IEEE Journal of Solid-State Circuits
Page(s): 1776 – 1790
Year of Publication: 2026
Electronic ISSN: 1558-173X
DOI: 10.1109/JSSC.2025.3644224
Publisher: IEEE

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