A Wideband Fully Integrated Software-Defined Transceiver for FDD and TDD Operation
A Wideband Fully Integrated Software-Defined Transceiver for FDD and TDD Operation
复制标题
适用于 FDD 和 TDD 操作的宽带完全集成软件定义收发器
DOI：
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发表时间：
2017
影响因子：
5.4
通讯作者：
A. Apsel
中科院分区：
文献类型：
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作者：
Hazal Yüksel;Dong Yang;Zachariah Boynton;Changhyuk Lee;Thomas Tapen;A. Molnar;A. Apsel
尽管对具有接收（RX）或发送（TX）功能的软件定义无线电（SDR）有很多积极的研究，但对支持频分双工（FDD）的SDR收发器的研究很少。在本文中，我们提出了一个新的电路概念，其中一个分布式TX电路取消发送信号在反向RX端口通过相消干涉，同时增加信号建设性地在一个前向TX端口。我们将分布式发射器与接收器跟踪PA退化技术配对，以抑制RX频带中来自TX电路的注入噪声。该系统不需要片外滤波器或循环器，但仍然实现了SDR灵活性以及FDD和时分双工功能。采用65 nm CMOS实现的收发器的测量结果显示，频率调谐范围为0.3-1.6 GHz，TX-RX隔离度>23 dB，发射功率高达19 dBm。
Although there is much active research on software-defined radios (SDRs) with receive (RX) or transmit (TX) functionality, little work has been done on SDR transceivers supporting frequency division duplex (FDD). In this paper, we present a new circuit concept in which a distributed TX circuit cancels the transmitted signal at a reverse RX port through destructive interference while adding signal constructively at a forward TX port. We pair the distributed transmitter with a receiver-tracking PA degeneration technique to suppress the injected noise from TX circuits in the RX band. The system does not require off-chip filters or circulators, but still achieves both SDR flexibility and both FDD and time division duplex function. Measurements from the transceiver implemented in 65-nm CMOS show a frequency tuning range of 0.3–1.6 GHz with TX–RX isolation >23 dB and transmitted power up to 19 dBm.