Abstract
In this paper, a band pass filter (BPF) design method considering the inverter’s frequency dependence is presented. In this method, the new admittance compensation method is added to the conventional method compensating for phase frequency variations. The proposed method efficiently improves the frequency shift and unwanted bandwidth when designing more than 20% of bandwidth, while the conventional method has frequency degradation at a 10% Fractional Bandwidth(FBW). The proposed design theory is verified by circuit simulation and measurement. The measured results show the improvement of 20MHz frequency shift and FBW. Furthermore, the proposed method is applied to the SAW Filter design method, and it is also approved that the frequency shift is compensated for when designing a 10% FBW.
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