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Integrated Transformer-Coupled Balun Bandpass Filters With an Optimal Common-Mode Rejection Ratio

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3 Author(s)
Chien-Hsun Chen ; Dept. of Electr. Eng., Nat. Sun Yat-Sen Univ., Kaohsiung, Taiwan ; Chien-Hsiang Huang ; Tzyy-Sheng Horng

This paper describes a compact transformer-coupled balun bandpass filter design based on integrated circuit technology. Using a planar transformer with high-density fully symmetrical wiring not only greatly reduces the component size, but also provides a superior balance at the differential output ports. In addition, applying the tapped feed-line structure to the balun bandpass filter is accomplished by carefully studying the impedance-matching method and transmission-zero mechanism. Interestingly, the proposed balun bandpass filter can guarantee an optimal common-mode rejection ratio level in a specific operating frequency range by precisely controlling the fractional bandwidth of the filter passband.

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Components, Packaging and Manufacturing Technology, IEEE Transactions on  (Volume:2 ,  Issue: 1 )