DocumentCode :
1300407
Title :
CMOS high-frequency switched-capacitor filters for telecommunication applications
Author :
Moon, Un-Ku
Author_Institution :
Bell Labs., Lucent Technol., Allentown, PA, USA
Volume :
35
Issue :
2
fYear :
2000
Firstpage :
212
Lastpage :
220
Abstract :
A digitally programmable high-frequency switched-capacitor filter for use in a switched digital video (SDV/VDSL) link is described. The highest available clock frequency in the system is 51.84 MHz (f/sub s/=2f/sub clock/=103.68 MHz for double sampling) while the three desired low-pass corner frequencies (f/sub c/) are 8,12, and 20 MHz. The double-sampling, bilinear, elliptic, fifth-order switched-capacitor filter meets the desired -40-dB attenuation at 1.3 f/sub c/, and -30 dB at 1.25 f/sub c/. For the 12-MHz corner frequency setting, given the 2V/sub pp/ differential input, the measured worst case total harmonic distortion is -60 dB, with signal-to-noise ratio of 54 dB. The analog power dissipation is 125 mW from a 5-V power supply. The test results indicate that the clock frequency can be increased to 73 MHz without any ill effects. More measurements verify that an all-digital CMOS implementation, utilizing metal-sandwich capacitors, performs as well as the special-layer analog capacitors implementation, with a small reduction in the absolute corner frequencies. The prototype IC´s are fabricated in a 0.35-/spl mu/m 5-V (0.48 /spl mu/m drawn) CMOS process.
Keywords :
CMOS integrated circuits; active filters; digital subscriber lines; digital video broadcasting; elliptic filters; harmonic distortion; switched capacitor filters; 0.35 micron; 125 mW; 5 V; 51.84 GHz; 8 to 20 MHz; CMOS; analog power dissipation; bilinear elliptic filter; clock frequency; corner frequency; digitally programmable filters; double sampling; double-sampling filter; fifth-order switched-capacitor filter; high-frequency switched-capacitor filters; low-pass corner frequencies; metal-sandwich capacitors; signal-to-noise ratio; switched digital video link; worst case total harmonic distortion; Attenuation; Capacitors; Clocks; Digital filters; Distortion measurement; Frequency measurement; Power dissipation; Sampling methods; Signal to noise ratio; Total harmonic distortion;
fLanguage :
English
Journal_Title :
Solid-State Circuits, IEEE Journal of
Publisher :
ieee
ISSN :
0018-9200
Type :
jour
DOI :
10.1109/4.823446
Filename :
823446
Link To Document :
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