Title :
A high CMRR current mode CMOS preamplifier for magnetic recording systems
Author :
Liu, Wei ; Kalkur, T.S.
Author_Institution :
Hewlett-Packard Co., Palo Alto, CA, USA
fDate :
2/1/1999 12:00:00 AM
Abstract :
This paper presents a high CMRR current mode CMOS preamplifier for a dual stripe magnetoresistive (DSMR) read head for magnetic recording systems. The current mode design approach a avoids high impedance nodes in the circuit and helps in achieving a high bandwidth. The differential circuit topology and the common mode negative feedback greatly improve the CMRR and PSRR. The preamplifier is designed using a 0.5 μm CMOS technology. The achieved 3-dB bandwidth is 120 MHz at a gain of 45 dB, the CMRR and PSRR are 62 and 74 dB respectively. The equivalent input noise voltage is 1.83 nV/√Hz
Keywords :
CMOS analogue integrated circuits; current-mode circuits; magnetic heads; magnetoresistive devices; preamplifiers; 0.5 micron; 120 MHz; 45 dB; CMRR; PSRR; common mode negative feedback; current mode CMOS preamplifier; differential circuit topology; dual stripe magnetoresistive read head; equivalent input noise voltage; magnetic recording system; Bandwidth; CMOS technology; Circuit topology; Gain; Impedance; Magnetic heads; Magnetic recording; Magnetoresistance; Negative feedback; Preamplifiers;
Journal_Title :
Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on
