Small percent bandwidth design of a 423-MHz notch-coupled micromechanical mixler

Sheng-Shian Li, Yu-Wei Lin, Yuan Xie, Z. Ren, C. Nguyen
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引用次数: 14

Abstract

Notching and low-velocity coupling design strategies are described and demonstrated that yield the first UHF vibrating micromechanical hollow-disk ring mixer-filters with IF bandwidths down to 0.05%, while still retaining reasonable passband shapes. Specifically, a 423-MHz mixer-filter, comprised of two mechanically coupled resonators exhibiting Q's in excess of 10,000, has been successfully demonstrated with a flat passband bandwidth of only 202 kHz. Like a previous 34-MHz mixer-filter based on clamped-clamped beam resonators, the much higher frequency device of this work is capable of performing both mixing (via capacitive transducer nonlinearity) from an RF frequency down to its IF passband centered at 423 MHz, then very small percent bandwidth filtering, e.g., to remove unwanted interferers in the receive path of a communication handset. The percent bandwidths demonstrated here are small enough to make possible channel-selection much earlier in a receive path chain, which could then greatly enhance the robustness and battery lifetime of future wireless transceivers.
423 mhz陷波耦合微机械混频器的小百分比带宽设计
本文描述并演示了陷波和低速耦合设计策略,产生了首个超高频振动微机械空心盘环混合滤波器,其中频带宽降至0.05%,同时仍保持合理的通带形状。具体来说,由两个Q值超过10,000的机械耦合谐振器组成的423 mhz混频器滤波器已成功演示,其平坦通带带宽仅为202 kHz。就像之前基于箝位箝位波束谐振器的34 MHz混频器滤波器一样,这项工作的更高频率设备能够从射频频率到以423 MHz为中心的中频通带进行混合(通过电容式换能器非线性),然后进行非常小的带宽滤波,例如,去除通信手机接收路径中不需要的干扰。这里展示的带宽百分比足够小,可以在接收路径链中更早地进行信道选择,这可以大大提高未来无线收发器的稳健性和电池寿命。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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