Apparatus for switching channels within a multi-channel read/wri

Details Apparatus for switching channels within a multi-channel read/wri Apparatus for switching channels within a multi-channel read/wri

1996-03-25

1998-06-02

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Parallel controlled paths

327407, 327411, H03K 1762

Patent

active

057606358

ABSTRACT:
A switching apparatus for switching between channels within a read/write pre-amplifier circuit in a multi-channel magnetic media storage system switches between the channels and couples an active magnetoresistive sensor to receive biasing current and to a pre-amplifier circuit. When a read operation is requested from a specific channel within the magnetic media storage system, a control signal line corresponding to an appropriate magnetoresistive sensor is activated. Each channel includes a first corresponding transistor which is enabled by an appropriate control signal line, allowing current to flow through the first transistor to enable a second corresponding transistor that is coupled to the magnetoresistive sensor. Once enabled the second transistor couples the magnetoresistive sensor to a pre-amplifier stage and to receive biasing current. The magnetoresistive sensor then transmits pulses, corresponding to the data being read from the magnetic medium, which are amplified by the pre-amplifier stage and provided as an output to a read channel. Multiple channels are supported, each including a magnetoresistive sensor and first and second corresponding transistors. A control logic circuit provides the control signal lines, one for each channel. A single compensation capacitor is included.

REFERENCES:
patent: 4905238 (1990-02-01), Rinaldis

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