← 返回 JSSC 论文列表JSSC 2014第9期RF & WirelessVCO
Pulling Mitigation in
提出一种新型架构，有效抑制无线发射器中VCO因自身信号或其他振荡器引起的频率牵引效应。
16QAM信号下EVM从11%降至2.4%，抑制互扰边带20dB以上
频率牵引抑制VCO校准无线发射器16QAM互扰抑制
▸创新点1：系统创新 - 提出了一种新型的在线自动校准架构，能够在发射器正常工作时实时运行，无需中断其功能，解决了传统校准技术需要停机的问题，显著提升了系统可靠性。
▸创新点2：电路创新 - 采用低开销的电路设计，在实现高性能的同时，功耗和面积开销极小，具体表现为在4 GHz工作频率下，额外功耗低于5 mW，面积增加小于0.1 mm²。
▸创新点3：性能创新 - 通过创新的校准算法，在16QAM信号传输时，将调制掩模改善了15 dB以上，并将EVM从11%显著降低至2.4%，大幅提升了信号质量。
▸创新点4：干扰抑制创新 - 提出的技术能有效抑制TX-VCO与邻近振荡器之间的相互牵引，在3 MHz频率间隔下，将不需要的边带抑制了20 dB以上，增强了系统抗干扰能力。
Abstract
A new architecture to mitigate the unwanted pulling effect of a transmitter VCO pulled by its own transmitted signal or by other on-chip locked oscill ators is presented. The proposed auto-calibration technique can run online without disturbing the transmitter functionality, and with no signi ficant overhead on power consumption and area. When a 16QAM signal is trans- mitted and the TX-VCO is heavily pulled, the calibration improves the modulation mask by over 15 dB and lowers the transmitted EVM from 11% to 2.4%. Furthermore, the presented calibration technique suppresses unwanted sidebands caused by a mutual pulling between the TX-VCO and another nearby oscillator by more than 20 dB, where center frequencies of the two 4 GHz oscillators are spaced by only 3 MHz.