一种基于分布式无源电路的100mhz至7ghz频率均衡器

Xiaoyu Cheng, E. David, Y. Yoon
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摘要

针对100MHz ~ 7ghz频段的便携式频谱分析仪前端电路,设计、分析并实现了一种基于分布式无源电路的紧凑型频率均衡器。均衡器是基于一个t形无源衰减器,由多个分布的电感和电容元件组成。作为测试载体,实现了一个3级宽带放大器,连接到设计的均衡器,并在目标频率范围内进行了表征。在没有均衡器的情况下,实现放大器的测量增益在34.7 dB到46.97 dB之间变化,在频率范围内显示12.27 dB的滚降。连接均衡器后,总增益变化减小到±1.1dB。与已有的频率均衡器相比,实现的频率均衡器占地面积小,为6×8 mm2,频率带宽为100MHz至7GHz。详细介绍了等效电路模型和一般设计准则,并进行了参数化分析。实现的均衡器适用于便携式频谱分析仪、矢量网络分析仪等紧凑型宽带测试测量仪器的前端电路。
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A compact 100 MHz to 7 GHz frequency equalizer based on distributed passive circuits
A compact frequency equalizer based on distributed passive circuits is designed, analyzed and implemented for the front end circuit of a portable spectrum analyzer working between 100MHz to 7 GHz. The equalizer is based on a T-shape passive attenuator consisting of multiple distributed inductive and capacitive elements. As a test vehicle, a 3-stage broadband amplifier has been implemented, connected to the designed equalizer, and characterized in the targeted frequency range. Without the equalizer, the measured gain of the implemented amplifier varies from 34.7 dB to 46.97 dB showing a 12.27 dB roll off in the frequency range. After connecting the equalizer, overall gain variation is reduced to ± 1.1dB. Compared with other preexisting frequency equalizers, the implemented one features a small footprint of 6×8 mm2 and a wide frequency bandwidth of 100MHz to 7GHz. Detail description on the equivalent circuit model and general design guidelines are given, and parametric analysis is performed. The implemented equalizer is suitable for the front end circuits of compact broadband test and measurement instruments, such as a portable spectrum analyzer and vector network analyzer.
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Parasitic electrical and electromagnetic effects Heat management Passive electronic components Interconnection technology Reliability and maintainability
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