JSSC 2025第11期RF & Wireless28nmCDRTransceiver

An 86.71875-GHz RF Transceiver for 57.8125-Gb/s Plastic Waveguide Links With a CDR-Assisted Carrier Synchronization Technique in 28-nm CMOS Hanho Choi , Ha-Il Song, Hyosup Won, Junyoung Yoo, Woohyun Kwon , Huxian Jin, Konan Kwon, Cheongmin Lee

一款86.71875GHz RF收发器IC，采用CDR辅助载波同步技术，实现57.8125Gb/s PAM-4数据传输。

28nm CMOS, 57.8125Gb/s PAM-4, 1.5m波导传输, 3.5pJ/b/m能效比

毫米波收发器载波同步PAM-4波导通信能效优化

▸创新点1：CDR辅助载波同步环路(CSL)技术（方法创新）。通过基带CDR实现载波同步，替代传统RF电路，显著降低功耗和面积，同时提升系统集成度。具体实现中，CDR与CSL协同工作，优化了同步精度和稳定性。

▸创新点2：基带CDR替代高功耗RF电路（电路创新）。采用基带CDR技术实现载波同步，避免了传统RF电路的高功耗和面积占用，实测功耗仅为190.1 mW（Tx）和117 mW（Rx），能效比显著提升。

▸创新点3：38%时序裕度提升（性能创新）。通过优化CDR和CSL的协同设计，时序裕度提升38%，显著提高了数据传输的可靠性和稳定性，支持57.8125 Gb/s的高速率传输。

▸创新点4：高能效比与紧凑面积（系统创新）。芯片面积仅为1.98 × 0.95 mm²，能效比达到3.5 pJ/b/m，在高速数据传输和能效方面均优于传统方案，适用于短距离波导链路。

Abstract

This article presents an 86.71875-GHz RF transceiver IC featuring a fully integrated clock and data recovery (CDR)-assisted carrier synchronization loop (CSL) for waveguide links. The carrier frequency of 86.71875 GHz is chosen to be the third harmonic of the baseband null frequency of 28.90625 GHz, and the carrier synchronization is achieved using a baseband CDR instead of power- and area-intensive RF circuits. The IC, fabricated in 28-nm CMOS, demonstrates 57.8125-Gb/s pulse-amplitude modulation-4 (PAM-4) data transmission over a 1.5-m waveguide channel while improving the timing margin by 38% compared to conventional methods. The Tx and Rx ICs occupying an area of 1.98 × 0.95 mm 2 consume 190.1 and 117 mW at 57.8125 Gb/s, respectively. The test chip achieves the figure of merit (FoM) of 3.5 pJ/b/m in terms of throughput– distance and energy efficiency.