用于移动电话的不平衡/平衡MCF

Proceedings of the 2001 IEEE International Frequncy Control Symposium and PDA Exhibition (Cat. No.01CH37218) Pub Date : 2001-06-06 DOI:10.1109/FREQ.2001.956342

T. Sakurai, Akihiro Soeda, T. Saitoh, O. Ishii

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引用次数: 0

摘要

在输入不平衡和输出平衡的单片晶体滤波器(MCF)中，由于各电极之间电容的变化，下侧的衰减具有较差的重复性。我们研究了一种具有良好和可重复衰减特性的非平衡/平衡MCF。我们在o-900 kHz时获得了超过90 dB的2极MCF(中心频率为109.65 MHz，第三泛音，终端阻抗为800欧姆//-0.3 pF)。我们还研究了具有良好特性的非平衡/平衡三极MCF。这是因为由于中心电极的屏蔽效应，每个电极之间的电容接近于零。

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An unbalanced/balanced MCF for cellular phone

In a monolithic crystal filter (MCF) which has an unbalanced-input and a balanced-output, the attenuation on the lower side has poor repeatability caused by the variation of capacitance between each electrode. We examined an unbalanced/balanced MCF that has good and repeatable attenuation characteristics. We obtained more than 90 dB at fo-900 kHz for a 2-pole MCF (center frequency is 109.65 MHz, 3rd overtone, terminating impedance is 800 ohm//-0.3 pF). We also examined an unbalanced/balanced 3-pole MCF which has good characteristics. This is because the capacitance between each electrode is close to zero due to the shield effect of the center electrodes.

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Proceedings of the 2001 IEEE International Frequncy Control Symposium and PDA Exhibition (Cat. No.01CH37218)

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