A low-power 5-70-MHz seventh-order log-domain filter with programmable boost, group delay, and gain for hard disk drive applications

Author

Baki, Rola A. ; El-Gamal, Mourad N.

Author_Institution

Dept. of Electr. & Comput. Eng., McGill Univ., Montreal, Que., Canada

Volume

38

Issue

2

fYear

2003

fDate

2/1/2003 12:00:00 AM

Firstpage

205

Lastpage

215

Abstract

A seventh-order 0.05° equiripple linear-phase continuous-time filter employing log-domain-based instantaneous companding was designed and integrated in a mature bipolar process. The amount of boost (up to 13 dB) and group-delay adjustment (±30%) are digitally programmable. The dc gain is controllable up to 10 dB, and the -3-dB frequency (f_c) is tunable from 5 to 70 MHz. The output swing for 1% total harmonic distortion is higher than 100 mV_pp, with a 1.5-V supply. The filter consumes very low power (5-13 mW for f_c=70 MHz) compared to conventional implementations (e.g., 120 mW for f_c=100MHz ).

Keywords

bipolar analogue integrated circuits; circuit tuning; continuous time filters; current-mode circuits; delays; equiripple filters; gain control; hard discs; linear phase filters; low-power electronics; programmable filters; 1.5 V; 5 to 13 mW; 5 to 70 MHz; current-mode circuit; dc gain control; digitally programmable group-delay adjustment; frequency tunability; group delay; hard disk drive applications; log-domain-based instantaneous companding; low-power seventh-order log-domain filter; mature bipolar process; output swing; partial-response maximum-likelihood; programmable boost; seventh-order equiripple linear-phase continuous-time filter; total harmonic distortion; very low power consumption; Delay; Energy consumption; Filtering; Frequency; Hard disks; Integrated circuit technology; Nonlinear filters; Power harmonic filters; Tunable circuits and devices; Voltage;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/JSSC.2002.807411

Filename

1175501