A 44-MHz wideband switched-capacitor bandpass filter using double-sampling pseudo-two-path techniques |
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Authors: | Ng KWH Cheung VSL Luong HC |
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Affiliation: | Dept. of Electr. & Electron. Eng., Hong Kong Univ. of Sci. & Technol., China; |
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Abstract: | A fully differential wideband sixth-order switched-capacitor bandpass filter is designed for channel selection in cable TV applications. A modified double-sampling pseudo-two-path technique is proposed to achieve a second-order wideband bandpass filter with a single opamp. Implemented in a standard double-poly four-metal 0.35-/spl mu/m CMOS process and operated at 176-MHz sampling frequency, the filter achieves a measured center frequency of 44 MHz with a bandwidth of 6.28 MHz and a dynamic range of 58.3 dB at 3% IM3. The filter consumes 92.5mW at a single 3.0-V supply and occupies a chip area of 0.52 mm /sup 2/. |
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