收发异源FMCW太赫兹系统误差分析

Error analysis for the FMCW terahertz system with different sources of transmitter and receiver

摘要:

近年来，随着太赫兹器件研究不断取得进展，对太赫兹收发前端的研究逐渐增多。随着工作频率的增加，以及带宽的增大，由器件非理想性能带来的误差成为影响太赫兹系统性能的重要因素。基于一个采用二级混频设计的收发异源调频连续波太赫兹系统，研究分析了时钟同步误差、调频非线性误差以及IQ不平衡问题所带来的误差。通过对3种误差的建模分析，为后续对误差进行消除和补偿提供了良好的理论基础。

Abstract:

In recent years, the research for transmitter and receiver of terahertz is increasing with the development of terahertz devices. The working frequency and the bandwidth increase gradually, and the error caused by device non-ideality becomes an important factor affecting the performance of terahertz system. A Frequency Modulated Continuous Wave(FMCW) terahertz system with a two-stage mixing design is studied. This system has different sources of transmitter and receiver. The clock synchronization error, the frequency modulation nonlinear error, and the error from IQ unbalance are analyzed. The modeling of these three kinds of errors provides a theoretical basis for error elimination and compensation in the future.