Vol. 25

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Packaged CMOS Transmission Line Based Active Bandpass Filter with High Stopband Suppression

By Meng-Lin Lee, Hsien-Shun Wu, and Ching-Kuang Tzuang
Progress In Electromagnetics Research C, Vol. 25, 1-14, 2012


This paper presents a packaged third-order transmission line based (TL-based) active bandpass filter (BPF), which is fabricated using Silterra's standard 0.18-μm CMOS 1P6M technology, with high stopband suppression. The active compensating circuit, which produces differential negative conductance, improves the quality factor (Q factor) of TL-based resonator and suppresses the spurious resonances at even-harmonic frequencies. The spurious responses are also shifted towards higher frequencies by applying a capacitively loaded TL resonator method to the filter design. Additionally, an inductive parasitic effect introduced by the package is investigated and reduced to achieve the minimum impact on the stopband suppression. Measurement results indicate that the prototype has an insertion loss of 0.95 dB at a central frequency (f0) of 1.53 GHz with a 3-dB bandwidth of 3.1%, while a current of 8 mA is consumed from 3.0 V. The stopband suppressions at 2f0 and 3f0 are 44.57 dB and 52.78 dB, respectively. Furthermore, the suppression exceeds 35 dB from 1.08f0 to 10.05f0.


Meng-Lin Lee, Hsien-Shun Wu, and Ching-Kuang Tzuang, "Packaged CMOS Transmission Line Based Active Bandpass Filter with High Stopband Suppression," Progress In Electromagnetics Research C, Vol. 25, 1-14, 2012.


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