Title :
A CMOS 650 MHz seventh-order current-mode 0.05° equiripple linear phase filter
Author :
Zhu, Xi ; Sun, Yichuang ; Moritz, James
Author_Institution :
Univ. of Hertfordshire, Hatfield
Abstract :
Read/write channels for hard disk drives (HDD) require high-frequency continuous time filters (CTF). A 650 MHz current-mode seventh-order 0.05deg equiripple linear phase low-pass filter for computer hard disk read/write channels with data rates up to 1 Gbit/s is presented in this paper. It is implemented in CMOS using a leap-frog multiple loop feedback structure. The operational transconductance amplifier (OTA) used is based on a differential pair and uses source degeneration to achieve linearization and tuning. Simulated using a standard 0.18 mum CMOS process, the dynamic range at 1% THD of the filter is 48 dB, cut-off frequency can be tuned from 590 MHz to 690 MHz, group delay ripple is about 5%, and power consumption is 370 mW from supply voltage of 2.5 V.
Keywords :
CMOS integrated circuits; UHF integrated circuits; continuous time filters; current-mode circuits; disc drives; hard discs; harmonic distortion; linear phase filters; low-pass filters; operational amplifiers; CMOS technology; UHF integrated circuits; continuous time filters; current-mode filters; equiripple linear phase filter; frequency 590 MHz to 690 MHz; hard disk drives; leap-frog multiple loop feedback structure; low-pass filter; operational transconductance amplifier; power 370 mW; read/write channels; size 0.18 mum; source degeneration; total harmonic distortion; voltage 2.5 V; CMOS process; Differential amplifiers; Dynamic range; Feedback loop; Hard disks; Low pass filters; Nonlinear filters; Operational amplifiers; Transconductance; Tuning;
Conference_Titel :
Circuits and Systems, 2007. MWSCAS 2007. 50th Midwest Symposium on
Conference_Location :
Montreal, Que.
Print_ISBN :
978-1-4244-1175-7
Electronic_ISBN :
1548-3746
DOI :
10.1109/MWSCAS.2007.4488563
