Read channel auxiliary high precision data conversion

Details Read channel auxiliary high precision data conversion Read channel auxiliary high precision data conversion

1996-04-18

2000-06-20

Hindi, Nabil

Dynamic magnetic information storage or retrieval

Converting an analog signal to digital form for recording;...

360 51, 341155, G11B 500, G11B 509, H03M 112

Patent

active

06078444&

ABSTRACT:
A circuit is provided for use with analog to digital conversion techniques in sampled amplitude read channel integrated circuits. A common ADC may be utilized for conversion of both high frequency disk data such as user data and servo data, for example, and for low frequency auxiliary data such as, for example, motor back-EMF current signals. The ADC may utilize the relatively low bit accuracy required for the read channel disk data and through oversampling techniques obtain sufficient conversion accuracy to meet the relatively higher precision requirements for the auxiliary data conversion. The auxiliary data is modified by a ramp signal and the ADC is run on a clock generated from a dithered frequency source so that ADC quantization errors may be randomized.

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