Composite output stage for hard disk drive preamplifier

Details Composite output stage for hard disk drive preamplifier Composite output stage for hard disk drive preamplifier

2005-08-31

2008-12-16

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C360S067000

Reexamination Certificate

active

07466200

ABSTRACT:
An apparatus for supplying a load current. The apparatus comprises a first differential amplifier producing a differential output signal and an output buffer comprising a first and a second parallel emitter follower transistors each producing a current responsive to the differential output signal. A second differential amplifier responsive to the differential output signal controls current mirror masters that in turn control current source mirrors. Current supplied by each of the current sources mirrors in cooperation with the current produced by each of the first and second transistors produce the load current.

REFERENCES:
patent: 6762896 (2004-07-01), Yoshizawa et al.
patent: 6965266 (2005-11-01), Can
patent: 7126596 (2006-10-01), Hogan
patent: 7239467 (2007-07-01), Yoshizawa et al.
patent: 0669709 (1995-08-01), None
patent: 2001297414 (2001-10-01), None

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