The first CMOS preamplifier IC for magnetoresistive (MR) read elements for use in state-of-the-art tape drives is presented. The circuit's noise performance of 0.8 nV//spl radic/Hz includes noise contributions from both the amplifier and the integrated current source needed to bias the MR elements. It will be shown that a single-ended input architecture is highly attractive for MR preamps because it offers advantages such as lowest noise levels and substantially reduced power and area consumption. Also, a current-mode amplifier (CMA) has been developed to enhance the preamp's bandwidth, large-signal capability and PSRR. The quad preamp has been implemented in a 1.2 /spl mu/m CMOS process and measures 4.5/spl times/4.24 mm/sup 2/.>
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Klein et al. (1994) studied this question.
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