Title :
A 5-V AC-Powered CMOS Filter-Selectivity Booster for POTS/ADSL Splitter Size Reduction
Author :
Säckinger, Eduard ; Tennen, Aner ; Shulman, Dima ; Wani, Barkat ; Rambaud, Marta ; Lím, Drahoslav ; Larsen, Fred ; Moschytz, George S.
Author_Institution :
Conexant Syst., Inc, Red Bank, NJ
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-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
Keywords :
CMOS analogue integrated circuits; continuous time filters; digital subscriber lines; low-pass filters; telephone equipment; 0.5 micron; 5 V; 50 mW; ADSL attenuation; CMOS analog integrated circuits; CMOS filter-selectivity booster; LC low-pass filter; POTS filters; POTS-ADSL splitters; active POTS filter; active filter; active rectifier; continuous-time filter; low output-impedance driver; splitter size reduction; Active filters; Band pass filters; Central office; Driver circuits; Frequency; Low pass filters; Passive filters; Rectifiers; Transformers; Voltage; Active filters; CMOS analog integrated circuits; Miller effect; POTS filters; POTS/ADSL splitters; continuous time filters; current limiters; driver circuits; feedback circuits; power supplies; rectifiers; transformers;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2006.884399
