一种高抑制电调滤波器的设计与实现

doi:10.16180/j.cnki.issn1007-7820.2019.01.009

电子科技 ›› 2019, Vol. 32 ›› Issue (1): 42-46.doi: 10.16180/j.cnki.issn1007-7820.2019.01.009

一种高抑制电调滤波器的设计与实现

刘乐乐¹,刘兰²,石玉¹,吴治霖³,胡越¹,温杰¹

^1. 电子科技大学微电子与固体电子学院,四川成都 610054
^2. 中国电子科技集团公司第二十九研究所, 四川成都 610036
^3. 中国电子科技集团公司第三十研究所,四川成都 610041

收稿日期:2017-12-23 出版日期:2019-01-15 发布日期:2018-12-29
作者简介:刘乐乐(1992-),女,硕士研究生。研究方向:电子科学与技术。
基金资助:
国家自然科学基金(61471086)

Design and Implementation of an Electrically Tunable Filter with High Suppression

LIU Lele¹,LIU Lan²,SHI Yu¹,WU Zhilin³,HU Yue¹,WEN Jie¹

^1. School of Microelectronics and Solid-state Electronics,University of Electronic Science and Technology of China, Chengdu 610054,China
^2. The 29^th Institute of China Electronic Technology Group Corporation,Chengdu 610036,China
^3. The 30^th Institute of China Electronic Technology Group Corporation,Chengdu 610041,China

Received:2017-12-23 Online:2019-01-15 Published:2018-12-29
Supported by:
National Natural Science Fund of China(61471086)

摘要/Abstract

摘要：

针对超外差接收机中前端预选宽频段、低损耗与高带外抑制度的需求,文中在电感耦合方式的LC电调滤波器基础上,增加了寄生通带抑制滤波器,设计了一款基于20~800 MHz调谐范围的电调滤波器。通过实际测试得到在调谐范围内,滤波器插入损耗<1.5dB,1 dB相对带宽约20%~30%,输入输出端口驻波<1.5,二倍频处抑制度>40 dBc,寄生通带抑制滤波器能将二次谐波和三次谐波寄生通带的抑制度分别提高40 dBc和30 dBc以上,从而利于滤波器在预选部分实现中频、镜频和本振反向等抑制作用。

关键词: 超外差接收机, 宽频段, 低损耗, 高带外抑制度, 电调滤波器, 寄生通带

Abstract:

For the demand of wide frequency band, low loss and high external restriction in the front preselection of superheterodyne receiver, a filter was increased to suppress the spurious band behind the LC electrically tunable filter with inductance coupling method in the article, designing an electrically tunable filter on account of 20~800 MHz . Actual test showed that in the tuning range, insertion loss of the filter was less than 1.5 dB, 1 dB bandwidth was about 20%~30%, VSWR of input and output ports were less than 1.5, suppression on the second harmonic frequency was more than 40 dBc. The suppression on the spurious band was increased more than 40 dBc in the second frequency and more than 30 dBc in the third harmonic frequency after applying this filter. All these benefited to the filter with the intermediate frequency suppression, mirror frequency suppression, the reverse leakage of vibration suppression, and so on.

Key words: superheterodyne receiver, wide frequency range, low insertion loss, high external restriction, electrically tunable filter, spurious band

中图分类号:

TN61

刘乐乐,刘兰,石玉,吴治霖,胡越,温杰. 一种高抑制电调滤波器的设计与实现[J]. 电子科技, 2019, 32(1): 42-46.

LIU Lele,LIU Lan,SHI Yu,WU Zhilin,HU Yue,WEN Jie. Design and Implementation of an Electrically Tunable Filter with High Suppression[J]. Electronic Science and Technology, 2019, 32(1): 42-46.

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参数	条件	数值
反向电路	V_R=30 V	≤10 nA
	V_R=30 V,T_a=85 ℃	≤100 nA
电容值	V_R=1 V	62~76 pF
	V_R=28 V	2.9~3.4 pF
电容变化率	f=1 MHz,
V_R=1 V/28 V	19.5~25 pF
纯电阻	f=100 MHz,C_T=30 pF	1.3 Ω
串联电感		2.8 nH

参数	条件	数值
反向电路	V_R=30 V	≤20 nA
	V_R=30 V,T_a=85 °C	≤500 nA
电容值	V_R=1 V	7.8~9.8 pF
	V_R=28 V	0.85~1.2 pF
电容变化率	f=1 MHz, V_R=1 V/28 V	7.8~9.5 pF
纯电阻	f=1 MHz,C_T=9 pF	1 Ω
串联电感		2.8 nH

一种高抑制电调滤波器的设计与实现

Design and Implementation of an Electrically Tunable Filter with High Suppression

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