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Browsing by Author "Wan, Shih-Ming"

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    CMOS Impedance Transforming Balun Filter with Improvement of Magnetic Coupling to Nearby Spiral Inductors
    (2011-01-01)
    Huang, Peng-Da
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    Chang, Wei-Shin
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    Chang, Chi-Yang
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    Wan, Shih-Ming
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    Chen, Cheng-Chung
    This paper presents a novel balun filter in TSMC 0.18 mu m CMOS technology which can suppress the magnetic coupling with nearby on-chip spiral inductors. The proposed balun filter keeps major requirements of a traditional coupled spiral inductor balun used in the output stage of a PA (power amplifier) such as center tap for DC bias, controllable impedance transformation ratio, good out-of-phase performance, etc. This new structure can achieve a maximum of 18 dB suppression of magnetic coupling to the nearby spiral inductor.