A design for high noise rejection in a pseudodifferential preamplifier for hard disk drives

Author

Ranmuthu, Indumini ; Emerson, Paul M. ; Maggio, Ken ; Jiang, Hong ; Manjekar, Ashish ; Bloodworth, Bryan E. ; Guastaferro, Mark

Author_Institution

Texas Instrum. Inc., Dallas, TX, USA

Volume

35

Issue

6

fYear

2000

fDate

6/1/2000 12:00:00 AM

Firstpage

911

Lastpage

914

Abstract

A study of supply and system noise rejection for a pseudodifferential amplifier is presented in this paper. This pseudodifferential amplifier is aimed at high data-rate disk drive signal sensing and preamplification applications. This high rejection was achieved by improving the rejection of the pseudodifferential amplifier and also by carefully designing the interconnect flex circuit where the preamplifier is mounted. The measured rejection to power supply, ground and system noise is above 50 dB over a 300 MHz bandwidth. This is significant for a pseudodifferential amplification system. The gain of the preamplifier is 47 dB and write mode to read mode switching time is 210 ns. This preamplifier currently supports disk drive data rates over 270 Mb/s.

Keywords

BiCMOS analogue integrated circuits; differential amplifiers; disc drives; hard discs; integrated circuit design; integrated circuit noise; interference suppression; preamplifiers; wideband amplifiers; 0.8 micron; 270 Mbit/s; 300 MHz; 47 dB; 5 V; BiCMOS process; disk drive signal preamplification; hard disk drives; high data-rate disk drive signal sensing; high noise rejection; interconnect flex circuit; pseudodifferential preamplifier; supply noise rejection; system noise rejection; Bandwidth; Circuit noise; Disk drives; Flexible electronics; Integrated circuit interconnections; Noise measurement; Power measurement; Power supplies; Power system interconnection; Preamplifiers;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.845195

Filename

845195