This article presents a direct RF-to-digital converter (RDC) for polar receivers, in which the amplitude information of the received signal is detected by a reconfigurable analog-to-digital converter (ADC) and its phase is digitized using a time-to-digital converter (TDC). The RDC prototype also includes a multi-phase reference generator and an ADC sampling position adjustment unit realizing the sub-sampling technique. Unlike conventional direct-RF sampling receivers, the proposed RDC samples the input RF signal at the baseband rate. The RDC is capable of digitizing a variety of modulation waveforms, such as quadrature amplitude modulation (QAM), phase shift keying (PSK), and amplitude phase shift keying (APSK). When comparing QAM to APSK, the later has advantages of relaxed system requirements on phase noise and linearity. The proposed direct RF-to-digital polar converter IC achieves a maximum data rate of 1.94 GB/s with a 1024-APSK modulation at a carrier frequency of 6 GHz, while consumes only 3.8 mW power under 1.1 V supply.

中文翻译：

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用于高吞吐量极化接收器的具有 1024-APSK 调制的子采样直接射频数字转换器

本文介绍了一种用于极性接收器的直接射频数字转换器 (RDC)，其中接收信号的幅度信息由可重构模数转换器 (ADC) 检测，并使用时间数字化对其相位进行数字化。数字转换器 (TDC)。RDC原型还包括一个多相位参考发生器和一个实现二次采样技术的ADC采样位置调整单元。与传统的直接 RF 采样接收器不同，所提出的 RDC 以基带速率对输入 RF 信号进行采样。RDC 能够将各种调制波形数字化，例如正交幅度调制 (QAM)、相移键控 (PSK) 和幅度相移键控 (APSK)。在比较 QAM 和 APSK 时，后者具有放宽系统对相位噪声和线性度要求的优势。