A low-power CMOS VGA for 50 Mb/s disk drive read channels

Author

Harjani, Ramesh

Author_Institution

Dept. of Electr. Eng., Minnesota Univ., Minneapolis, MN, USA

Volume

42

Issue

6

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

370

Lastpage

376

Abstract

We describe an all CMOS variable gain amplifier (VGA) suitable for use in disk drive read channels. The VGA maintains a 3 dB bandwidth greater than 85 MHz throughout its gain range. This ensures good phase linearity for data transfer rates of up to 50 Mb/s. The VGA provides a 25 db gain variation along an ideal exponential gain to control voltage curve and 30 dB of gain control if ideal exponential characteristics is not absolutely necessary. The VGA achieves the necessary exponential gain to control voltage characteristics intrinsically using only MOS transistors as a single unit to reduce power and area consumption. Overall power consumption is less than 10 mW for the VGA circuit excluding the off-chip buffer circuits

Keywords

CMOS analogue integrated circuits; automatic gain control; delays; magnetic disc storage; 10 mW; 30 dB; 50 Mbit/s; CMOS; area consumption; data transfer rates; disk drive read channels; ideal exponential gain; off-chip buffer circuits; phase linearity; power consumption; variable gain amplifier; voltage characteristics; voltage curve; Bandwidth; Character generation; Circuits; Disk drives; Energy consumption; Frequency; Gain control; Linearity; MOSFETs; Voltage control;

fLanguage

English

Journal_Title

Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

1057-7130

Type

jour

DOI

10.1109/82.392312

Filename

392312