Disk drive with preamplifier for multiple readers in a slider with a common return signal

摘要

Disk drive embodiments with common lead connections in the slider, suspension, and preamplifier are described. The arm electronics IC includes a preamplifier with single-ended input from the set of signal traces that include a common signal return lead for the plurality of read transducers (readers) in the slider. Two embodiments of the preamps are described that include a single-ended design and a pseudo-single-ended design. Each embodiment supplies the required bias to each read transducer using an operational transconductance amplifier (OTA) that drives a variable current source connected to the transducer. The positive input to the OTA is a DC voltage with the AC signal from the transducer imposed on it. The negative input is a DC reference voltage. Various embodiments of the signal trace configuration on the suspension are described including a single and double layer embodiments.

主权项

1. A disk drive comprising:
a slider with a plurality of read transducers that are each connected to a common return signal lead; a suspension with a set of signal traces that include a first trace connected to the common return signal lead in the slider and a selected signal trace connected respectively to each of the plurality of read transducers; and a preamplifier connected to the set of signal traces on the suspension, the preamplifier having an input from each of the read transducers and being connected to the first trace as the common return signal lead, the preamplifier supplying a bias current for each read transducer through the selected signal trace connected to each read transducer.