DocumentCode
517202
Title
150 MHz Preamplifier for Magneto-Resistive Heads
Author
Ramalho, J.N. ; Voorman, J.O. ; Veenstra, H. ; Desbonnets, E.
Author_Institution
Philips Research Laboratories, Prof. Holstlaan 4, Eindhoven, The Netherlands
fYear
1995
fDate
19-21 Sept. 1995
Firstpage
42
Lastpage
45
Abstract
This paper presents the read section of a 10-channel preamplifier for hard-disk-drive applications that use magneto-resistive-read/inductive-write heads. Ten dedicated low-noise amplifier stages use a current-bias current-sense architecture with grounded magneto-resistive (MR) heads. The amplifier also contains gain stages common to all heads, a high-frequency gain-boost, an MR bias current-DAC and a serial interface to program the IC. The preamplifier is designed in a 2.5 ¿m BiCMOS technology. Measurements using a single supply voltage of 3.8-5.5V show a ¿3 dB bandwidth of 120 MHz (without gain-boost) up to 180 MHz (with some gain-boost) and an input referred noise of 0.9 nV/¿Hz.
Keywords
Bandwidth; BiCMOS integrated circuits; Breakdown voltage; Electric resistance; Impedance; Low-noise amplifiers; Magnetic heads; Noise reduction; Preamplifiers; Resistors;
fLanguage
English
Publisher
ieee
Conference_Titel
Solid-State Circuits Conference, 1995. ESSCIRC '95. Twenty-first European
Conference_Location
Lille, France
Print_ISBN
2-86332-180-3
Type
conf
Filename
5469337
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