B2 - Traceable Terahertz Transceivers

Meteracom的B2项目重点研究电子太赫兹模拟发射和接收前端的信号可追溯性，包括其宽带太赫兹信号产生、转换、放大和采样的功能模块。第二阶段的主要目标是将收发器功能扩展到物理芯片级的损伤可追溯性，改进基于光电锁相环的太赫兹频率合成器，并进行联合太赫兹通信实验。在第1阶段建立的太赫兹收发器芯片组和综合电磁电路设计流程的基础上，收发器mmic应通过自检、自校准和在线测试功能来增强，在功能收发器级之间包括标量或矢量功率检测器（PI Kallfass）。此外，收发器应配备可变增益放大器，以实现自动增益控制。由此产生的“可追溯太赫兹收发器”将为C3项目中物理收发器模型的校准提供测量平台，并为面向机器学习的项目C1和C2以及可追溯性项目t提供测量数据。B2项目将向其他项目提供从现有300 GHz链路获得的测量数据，该链路能够进行频分复用和复杂数字调制，最高可达256 QAM，符合ieee802.15.3 3d标准。第一阶段演示的基于光电锁相环（OEPLL）的宽带太赫兹合成器需要进一步改进（PI Scheytt）。改进的目标是更低的相位噪声和改进的频率调谐分辨率。对改进后的OEPLL的相位噪声和杂散进行了数学分析和建模。一个改进的OEPLL合成器将被建立和测量，以验证数学分析。改进后的OEPLL合成器模型将集成到C3的物理收发器模型中。关于光学采样技术（PI Schneider, PI Scheytt），在第一阶段，主要的误差来源被确定为射频源的抖动、连续波激光或MLL的相位噪声和非线性。在第二阶段，我们将以这些结果为基础，与A3紧密合作，我们将使用C3开发的算法和模型来评估太赫兹通信实验。

The B2 project of Meteracom focuses on the signal traceability in electronic THz analog transmit and receive frontends, including their functional building blocks for wideband THz signal generation, translation, amplification and sampling. The main objectives in phase II are to expand the transceiver functionalities towards the traceability of impairments on the physical chip level, to improve the THz frequency synthesizer based on the optoelectronic PLL and to conduct joint THz communication experiments. Building on the THz transceiver chip sets and the comprehensive electro-magnetic circuit design flow established in phase 1, the transceiver MMICs shall be enhanced through self-test, self-calibration and in-circuit test functionality, by including scalar or vectorial power detectors between functional transceiver stages (PI Kallfass). Furthermore, the transceivers shall be equipped with variable gain amplifiers for automatic gain control. The resulting “traceable THz transceivers” will provide a measurement platform for the calibration of the physical transceiver model in project C3, and provide measurement data for the machine-learning oriented projects C1 and C2 and the traceability project T. Right from the start of phase 2, the B2 project will provide measurement data to fellow projects obtained from an existing 300 GHz link capable of frequency-division-multiplexing and complex digital modulation up to 256 QAM inline with the IEEE802.15.3d standard. The wideband THz synthesizer based on an optoelectronic PLL (OEPLL) which was demonstrated in the first phase shall be further improved (PI Scheytt). The improvements target even lower phase noise and improved frequency tuning resolution. The phase noise and spurs of the modified OEPLL will be mathematically analyzed and modelled. An improved OEPLL synthesizer will be built and measured to validate the mathematical analysis. The model of the improved OEPLL synthesizer will be integrated into the physical transceiver model of C3. Regarding optical sampling techniques (PI Schneider, PI Scheytt), in the first phase the major error sources have been determined to be the jitter of the RF source, the phase noise of the CW laser or MLL, respectively, and nonlinearity. In the second phase, we will build on these results and, in strong collaboration with A3, we will use algorithms and models developed in C3 for the evaluation of THz communication experiments.