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A 5-V AC-Powered CMOS Filter-Selectivity Booster for POTS/ADSL Splitter Size Reduction

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8 Author(s)
Sackinger, E. ; Conexant Syst., Inc, Red Bank, NJ ; Tennen, A. ; Shulman, D. ; Wani, B.
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An active POTS filter consisting of a small external L-C low-pass filter and a selectivity booster chip is presented. The filter achieves an ADSL attenuation of more than 70 dB at 30 kHz while maintaining a passband flatness of 0.2 dB. This active filter requires fewer transformers and is smaller than a passive filter with the same performance. The 0.5-mum CMOS booster chip contains a fifth-order continuous-time filter, a low output-impedance driver, and an active rectifier and consumes 50 mW from a 5-V AC supply

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:41 ,  Issue: 12 )

Date of Publication:

Dec. 2006

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