| 摘要 |
This patent teaches multiplexing MR head circuits to an off-chip capacitor in novel ways to eliminate excessive numbers of off-chip components. The bias current is switched off for each MR head when it is not in use and the bias current is supplied only to the MR head being employed at a given time. On the sensing side, the invention teaches connecting a single capacitor across a plurality of pairs of transistor emitters, each pair of transistors having their collectors (assuming NPN) connected to the sense lines of one of the MR heads. A number of example circuits are illustrated and described, including one employing PNP transistors.
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