학술논문
A 5-V AC-Powered CMOS Filter-Selectivity Booster for POTS/ADSL Splitter Size Reduction
Document Type
Periodical
Author
Source
IEEE Journal of Solid-State Circuits IEEE J. Solid-State Circuits Solid-State Circuits, IEEE Journal of. 41(12):2877-2884 Dec, 2006
Subject
Language
ISSN
0018-9200
1558-173X
1558-173X
Abstract
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-$\mu{\hbox {m}}$ 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.