| Effect of Center Frequency Deviation in Miniaturized CMOS Bandpass Filter |
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In-Ho Kang, Shang-Ming Li, Xin Guan |
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| Abstract |
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In this letter, the effect of quality factor on center frequency deviation in miniaturized coupled line bandpass filter (BPF) with diagonally end-shorted at their opposite sides and lumped capacitors is theoretically analyzed. The miniaturized BPF of a two-stage structure with two types of quality factors in standard CMOS process was designed and manufactured at 5.5 ㎓. The die area of BPF was 1.44 × 0.41 ㎟. The measured center frequency of BPF with a quality factor of 4.9 was deviated from 5.5 ㎓ to 4.7 ㎓. The one with 14.8 was shifted to 5㎓. The theoretical and measured results validate that quality factor influences the center frequency shift of BPF. |
| Key Words:
Center frequency shifts;Quality factor;Shunt resonator;Substrate loss;Bandpass filter;CMOS |
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