Method and circuits for high speed powerup of analog...

Details Method and circuits for high speed powerup of analog... Method and circuits for high speed powerup of analog...

1999-02-08

2001-05-29

Faber, Alan T. (Department: 2753)

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

C360S067000, C360S046000, C330S127000, C327S530000

Reexamination Certificate

active

06239933

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to the data processing field, and more particularly, relates to a method and circuits for high speed powerup of an analog reference source for use in a direct access storage device (DASD).
DESCRIPTION OF THE RELATED ART
As channel speeds increase, conventional arrangements of circuit functions can be a limiting factor in overall performance in a direct access storage device (DASD). In the design of new DASDs, the performance requirements are more demanding and faster operation generally is required.
A need exists for fast powerup of an analog reference voltage which can be used for generating gate voltages of current sources or base voltages of current sources.
SUMMARY OF THE INVENTION
A principal object of the present invention is to provide an improved method and circuits for high speed powerup of an analog reference source, such as used in a direct access storage device (DASD).
In brief, a method and circuits are provided for high speed powerup of an analog reference source, such as used in a direct access storage device (DASD). The high speed powerup circuits for the analog reference source include a biasing current source. Biasing circuitry is provided for establishing a first bias reference voltage level. An enable input is provided for disabling and for enabling powerup of the analog reference source. A transistor switch is coupled between the bias reference voltage level and the analog reference source. The transistor switch is operatively controlled by the enable input for driving the analog reference source and enabling fast powerup of the analog reference source.


REFERENCES:
patent: 5426542 (1995-06-01), Smith

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