Future Wei Technologies, Inc.

Cirrus Logic Inc.

Huawei Technologies Co., Limited

Charles J Duey

Michael Lee Bushman

James Caldwell

Richard T Behrens

Alan J Armstrong

James W Caldwell

Renee E Wallerius

A voltage controlled oscillator includes a resonator and an amplifier. The resonator includes a capacitive element and an inductive element. The inductive element has a plurality of conductive segments forming a physical loop. The inductive element has electrical connections on the physical loop to the plurality of conductive segments forming at least one electrical loop disposed within an interior space formed by the physical loop. The amplifier has an input and an output, the input coupled to a first conductive segment forming a first impedance and the output coupled to a second conductive segment forming a second impedance.

Tapped inductor voltage controlled oscillator

A method and apparatus for calibrating the components of a Partial Response Read Channel (PRML) integrated circuit utilized in a magnetic storage device including a channel quality circuit, incorporated within the read channel IC, for automatically measuring the performance of each component as data is read by the channel. An error measurement for each component is generated as an indicator of the component's performance, such as a sample error generated by measuring the difference between the samples read by the channel and expected samples. The read channel components are programmed over a range of settings to determine the settings that generate the minimum error. By programming the components with settings corresponding to minimum error rates, the read channel is optimized. A programming device incorporated within the magnetic storage device and connected to the read channel IC executes a calibration program when the storage device is manufactured, repaired, and periodically to compensate for changes in the storage device and storage medium that occur over time.

Method and apparatus for calibrating a synchronous read channel integrated circuit

Growing community of inventors

Westminster, CO, United States of America

Charles J Duey