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A 44-MHz wideband switched-capacitor bandpass filter using double-sampling pseudo-two-path techniques

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3 Author(s)
Ng, K.W.H. ; Dept. of Electr. & Electron. Eng., Hong Kong Univ. of Sci. & Technol., China ; Cheung, V.S.L. ; Luong, H.C.

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-μm 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 2.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:40 ,  Issue: 3 )