超外差接收机下变频增益变化的分析与验证

doi:10.16183/j.cnki.jsjtu.2024.474

上海交通大学学报 ›› 2026, Vol. 60 ›› Issue (8): 1385-1392.doi: 10.16183/j.cnki.jsjtu.2024.474

• 电子信息与电气工程 • 上一篇

超外差接收机下变频增益变化的分析与验证

欧阳强生¹^,², 王小松¹^,², 刘昱¹^,²^,³()

¹ 中国科学院微电子研究所, 北京 100029
² 中国科学院大学集成电路学院, 北京 101408
³ 北京脑科学与类脑研究所, 北京 102206

收稿日期:2024-11-21 修回日期:2025-01-06 接受日期:2025-02-16 出版日期:2026-08-28 发布日期:2026-09-02
通讯作者: 刘昱 E-mail:liuyu5@ime.ac.cn
作者简介:欧阳强生(1999—),硕士生,从事模拟与射频CMOS集成电路设计研究.
基金资助:
国家重点研发计划(2022YFF1202302)

Analysis and Verification of Down-Conversion Gain Variation in Sliding-IF Receiver

OUYANG Qiangsheng¹^,², WANG Xiaosong¹^,², LIU Yu¹^,²^,³()

¹ Institute of Microelectronics of the Chinese Academy of Sciences, Beijing 100029, China
² School of Integrated Circuits, University of Chinese Academy of Sciences, Beijing 101408, China
³ Chinese Institute for Brain Research, Beijing 102206, China

Received:2024-11-21 Revised:2025-01-06 Accepted:2025-02-16 Online:2026-08-28 Published:2026-09-02
Contact: LIU Yu E-mail:liuyu5@ime.ac.cn

摘要/Abstract

摘要：

在超外差接收机中,两级本振之间的相位差会影响多个谐波的下变频增益.为更全面地分析两级本振间的相位差对3个关键谐波的下变频增益影响,首先,就正交和非正交两种解调方式给出详细的数学分析,并关注镜频以外频率上的干扰信号影响;然后,基于数学分析结果,确定在正交和非正交解调中,两级本振的上升沿分别相差第1级本振周期的1/8和1/4时有较好抑制干扰的效果;最后,为验证理论分析的正确性,设计一个印刷电路板级的超外差无源混频器来完成实物测试,结果表明测试结果与理论分析一致.

关键词: 超外差接收机, 镜像频率抑制, 混频器

Abstract:

In a sliding-IF receiver, the phase shift between two local oscillators (LOs) affects the down-conversion gain of multiple harmonics. In this paper, the impact of the phase shift between two LOs on the down-conversion gain of three key harmonics is more comprehensively analyzed. First, a detailed mathematical analysis is presented for both quadrature and non-quadrature demodulation methods, with particular attention to the effect of interference signals at frequencies other than the image frequency. Then, based on the results of the mathematical analysis, it is determined that in quadrature and non-quadrature demodulation, a shift of one-eighth and one-quarter of the period of the first LO between the two LOs’ rising edges offers better interference suppression effects, respectively. Finally, to verify the theoretical analysis, a printed-circuit-board-level sliding-IF passive mixer is designed for physical testing. The experimental results show that the measurement results are consistent with the theoretical analysis.

Key words: sliding-IF receiver, image frequency suppression, mixer

中图分类号:

TN432

欧阳强生, 王小松, 刘昱. 超外差接收机下变频增益变化的分析与验证[J]. 上海交通大学学报, 2026, 60(8): 1385-1392.

OUYANG Qiangsheng, WANG Xiaosong, LIU Yu. Analysis and Verification of Down-Conversion Gain Variation in Sliding-IF Receiver[J]. Journal of Shanghai Jiao Tong University, 2026, 60(8): 1385-1392.

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参考文献 12

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谐波	0<α<0.25	0.25<α<0.5
镜频	减少	增加
射频	增加	减少
邻频	增加	减少

谐波	0<α<0.25	0.25<α<0.5
镜频	减少	增加
射频	增加	减少
邻频	增加	减少

谐波	0<α< 0.125	0.125<α< 0.25	0.25<α< 0.375	0.375<α< 0.5
镜频	不变	不变	减少	增加
射频	增加	减少	不变	不变
邻频(n≠4)	不变	不变	增加	减少
邻频(n=4)	不变	不变	不变	不变

超外差接收机下变频增益变化的分析与验证

Analysis and Verification of Down-Conversion Gain Variation in Sliding-IF Receiver

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