Capacitor bias recovery methodology

The present invention relates to disk drive circuits and, more particularly, to an apparatus, system and method for biasing a hard disk drive circuit. A preamplifier circuit for a hard disk drive system comprises a preamplifier circuit having a bias voltage circuit stage associated therewith. The pr...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: Iroaga, Echere, Manjrekar, Ashish, Bloodworth, Bryan E
Format: Patent
Sprache:eng
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Beschreibung
Zusammenfassung:The present invention relates to disk drive circuits and, more particularly, to an apparatus, system and method for biasing a hard disk drive circuit. A preamplifier circuit for a hard disk drive system comprises a preamplifier circuit having a bias voltage circuit stage associated therewith. The preamplifier circuit further comprises a current bias boost recovery circuit operatively coupled to the bias voltage circuit stage which is configured to increase a rate of charging of a noise reduction capacitor associated with the bias voltage circuit stage. A head select boost recovery circuit is also operatively coupled to the bias voltage circuit and is configured to increase a rate of charging or discharging of a bias capacitor associated with the bias voltage circuit stage. Together the circuits allow for a concurrent head switch and current bias switch and avoids the problems associated with the prior art.