This article presents a fully integrated Fourier-domain digital-to-analog converter-based transmitter (Tx). The proposed topology generates a coherent bandwidth (BW) of up to 2 GHz by exploiting the relationship between the discrete and the continuous-time Fourier transform. Thus, the digital-to-analog converter (DAC) sampling rate and the entire digital signal processing (DSP) speed are reduced by up to two orders of magnitude compared to conventional Txs. Moreover, the proposed technique provides intrinsic spectral shaping increasing the spectral efficiency of the output signal. Thus, no complex and high-speed signal processing in terms of oversampling and filtering is required to provide spectral shaping in order to attenuate the out-of-band emissions. The proposed concept is experimentally demonstrated by a fully integrated Tx prototype, including the DSP in 65-nm CMOS technology. It generates a single-carrier signal with a modulation BW of up to 2 GHz and a modulation order of up to 16QAM in the sub-6-GHz frequency range. The occupied chip area is 1.34 mm ² . The best measured error vector magnitude (EVM) values with equalization are 13.6% and 17.7% for a 1- and 2-GHz QPSK signal, respectively, whereas for a 1-GHz-wide 16QAM signal, an EVM of 12.4% is measured. Thus, the maximum demonstrated data rate is 4 Gb/s.

中文翻译：

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具有高达 2GHz 调制带宽的基于傅立叶域 DAC 的无线发射器

本文介绍了一种完全集成的基于傅立叶域数模转换器的发射器 (Tx)。所提出的拓扑通过利用离散时间和连续时间傅立叶变换之间的关系生成高达 2 GHz 的相干带宽 (BW)。因此，与传统 Tx 相比，数模转换器 (DAC) 采样率和整个数字信号处理 (DSP) 速度最多降低了两个数量级。此外，所提出的技术提供增加输出信号的频谱效率的固有频谱整形。因此，在过采样和滤波方面不需要复杂和高速的信号处理来提供频谱整形以衰减带外发射。所提出的概念通过完全集成的 Tx 原型进行了实验证明，包括采用 65 纳米 CMOS 技术的 DSP。它在低于 6 GHz 的频率范围内生成调制带宽高达 2 GHz 和调制阶数高达 16QAM 的单载波信号。占用芯片面积 1.34 mm ² . 对于 1 GHz 和 2 GHz QPSK 信号，均衡的最佳测量误差矢量幅度 (EVM) 值分别为 13.6% 和 17.7%，而对于 1GHz 宽的 16QAM 信号，测得的 EVM 为 12.4%。因此，已证明的最大数据速率为 4 Gb/s。