Differential sense of embedded contact sensor (ECS) and near-field temperature sensor (NTS) utilizing chopping amplifier
AssigneeWestern Digital Technologies, Inc.
InventorsJohn T. Contreras, Joey M. Poss, Bernhard E. Knigge
Life of this patent
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Abstract
A data storage device comprises a first resistive temperature detector (RTD) and a second RTD coupled to a first voltage source. A tuning bridge coupled between the first and second RTDs and a second voltage source reduces offset between a first bias voltage across the first RTD and a second bias voltage across the second RTD. A low noise amplifier (LNA) receives the first and second bias voltages as a differential bias voltage. A modulator coupled between the first and second RTDs and the LNA modulates the differential bias voltage.
Claims26
A data storage device comprising:
- a first resistive temperature detector (RTD) and a second RTD coupled to a first voltage source;
- a tuning bridge coupled between the first and second RTDs and a second voltage source, the tuning bridge being configured to reduce offset between a first bias voltage across the first RTD and a second bias voltage across the second RTD;
- a low noise amplifier (LNA) configured to receive the first bias voltage and the second bias voltage as a differential bias voltage;
- and
- a modulator coupled between the first and second RTDs and the LNA to modulate the differential bias voltage.
A method for differential sensing of bias voltages across resistive temperature detectors (RTDs) in a data storage device, comprising:
- generating a first bias voltage across a first RTD coupled between a first voltage source and a second voltage source and a second bias voltage across a second RTD coupled between the first and second voltage sources;
- reducing offset between the first bias voltage and the second bias voltage;
- and
- modulating a differential bias voltage between the first RTD and the second RTD and amplifying the modulated differential bias voltage.
A circuit for differential sensing of bias voltages across resistive temperature detectors (RTDs) in a data storage device, comprising:
- a first RTD and a second RTD coupled to a first voltage source;
- a tuning bridge coupled between the first and second RTDs and a second voltage source, the tuning bridge being configured to reduce offset between a first bias voltage across the first RTD and a second bias voltage across the second RTD;
- and
- a low noise amplifier (LNA) configured to receive the first bias voltage and the second bias voltage as a differential bias voltage.
A data storage device comprising:
- a first resistive temperature detector (RTD) coupled between a first voltage source and a second voltage source;
- a second RTD coupled between the first voltage source and the second voltage source;
- a low noise amplifier (LNA) configured to receive a first bias voltage across the first RTD and a second bias voltage across the second RTD as a differential bias voltage;
- and
- a modulator coupled between the first and second RTDs and the LNA to modulate the differential bias voltage.
Dependencies are inferred from the claim text.