A 28-MHz wideband switched-capacitor bandpass filter with transmission zeros for high attenuation |
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| Authors: | Ng K.W.H. Luong H.C. |
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| Affiliation: | Dept. of Electr. & Electron. Eng., Hong Kong Univ. of Sci. & Technol., China; |
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| Abstract: | A 28-MHz wideband switched-capacitor (SC) bandpass filter employs an N-path technique and implements transmission zeros in the transfer function to achieve high attenuation. A modified SC biquadratic filter architecture is proposed to achieve high-speed operation. Implemented in a 0.35-/spl mu/m CMOS process, the bandpass filter operates at 28-MHz center frequency with a 3.84-MHz bandwidth and adjacent-channel attenuation of more than 35 dB. At 3-V supply, the filter measures a dynamic range of 37 dB at the 1% THD3 point while dissipating 19.6-mW per pole and occupying a chip area of 1.65 mm/sup 2/. |
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