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    AVALANCHE PHOTODIODE GAIN COMPENSATION FOR WIDE DYNAMIC RANGE
    1.
    发明申请
    AVALANCHE PHOTODIODE GAIN COMPENSATION FOR WIDE DYNAMIC RANGE 有权

    公开(公告)号：US20230062555A1

    公开(公告)日：2023-03-02

    申请号：US17462170

    申请日：2021-08-31

    Applicant: Seagate Technology LLC

    Inventor： Adam R. Bush ,  Walter R. Eppler ,  Kevin A. Gomez

    IPC: G01S7/4865 ,  G01S7/487 ,  G04F10/00

    Abstract: An optical receiver includes a parasitic current compensation circuit having a reference diode, a sense avalanche photodiode (APD), at least one DC voltage source, and a measurement node. The at least one DC voltage source is configured to generate a first DC bias voltage that varies over time and drives the reference diode, and generates a second DC bias voltage that varies over time and drives the sense APD. A reference parasitic current travels through the reference diode based on the first DC bias voltage. A sense current travels through the sense APD based on the second DC bias voltage and exposure of the sense APD to a light signal. The measurement node receives a sense photocurrent, which is generated by the sense APD in response to the exposure of the sense APD to the light signal, the sense photocurrent including the sense current less the reference parasitic current.

    Capacitively operated microwave assisted magnetic recording oscillator
    2.
    发明授权
    Capacitively operated microwave assisted magnetic recording oscillator 有权

    公开(公告)号：US11056134B1

    公开(公告)日：2021-07-06

    申请号：US16722886

    申请日：2019-12-20

    Applicant: Seagate Technology LLC

    Inventor： Walter R. Eppler

    IPC: G11B5/31 ,  G11B5/127 ,  G11B11/08 ,  G11B5/60 ,  G11B5/00

    Abstract: An apparatus includes a write pole that stores data on tracks on a data storage medium. The apparatus also includes side shields on first and second sides of the write pole, and a trailing shield above the write pole and above the side shields. The apparatus further includes a microwave assisted magnetic recording oscillator having conductive pads that form capacitors with portions of a conductive film of the data storage medium. The conductive pads are positioned on a medium-facing surface of a slider that includes the write pole, the side shields and the trailing shield.

    Media storage areal density
    4.
    发明授权
    Media storage areal density 有权

    公开(公告)号：US10255945B1

    公开(公告)日：2019-04-09

    申请号：US15945555

    申请日：2018-04-04

    Applicant: Seagate Technology LLC

    Inventor： Mehmet Fatih Erden ,  Steven Douglas Granz ,  Peter S. Harllee ,  Stephanie Hernandez ,  Walter R. Eppler

    IPC: G11B20/12

    Abstract: In one implementation, the disclosure provides a method comprising detecting one or more areas of a storage medium having a data pattern with a plurality of consecutive bits, where the consecutive bits have the same polarity. The method further comprises encoding additional information on a section of the one or more detected areas, where the section of the one or more detected areas has a signal to noise ratio (SNR) higher than SNR of the other areas of the storage media.

    Partial pulse pairing for improved read signal quality
    6.
    发明授权
    Partial pulse pairing for improved read signal quality 有权

    公开(公告)号：US11908502B2

    公开(公告)日：2024-02-20

    申请号：US17694442

    申请日：2022-03-14

    Applicant: Seagate Technology LLC

    Inventor： Walter R. Eppler ,  Drew Michael Mader

    IPC: G11C16/10 ,  G11C11/16 ,  H03M1/06

    CPC classification number: G11C11/1673 ,  G11C11/1675 ,  G11C11/1677 ,  G11C11/1693 ,  H03M1/0636

    Abstract: A method for reducing noise in a read signal due attributable to read element asymmetry provides for transmitting a write signal through a write precompensation circuit that shifts rising edges and falling edges of each of pulse in the write signal by a select magnitude and in opposite directions. After the write signal is encoded on a media, a corresponding read signal is read, with a read element, from the media. The method further provides for transmitting the read signal through a magnetoresistive asymmetry compensation (MRAC) block that is tuned to correct second-order non-linearities characterized by a particular set of distortion signatures. The select magnitude of the waveform shift applied by the write precompensation circuit introduces a non-linear signal characteristic that combines with non-linear signal characteristics introduced by the read element to generate one of the particular distortion signatures that is correctable by the MRAC block.

    ANALOG DEMODULATION OF PHASE MODULATED CONTINUOUS WAVE (PMCW) LiDAR
    8.
    发明申请
    ANALOG DEMODULATION OF PHASE MODULATED CONTINUOUS WAVE (PMCW) LiDAR 有权

    公开(公告)号：US20230071722A1

    公开(公告)日：2023-03-09

    申请号：US17899126

    申请日：2022-08-30

    Applicant: Seagate Technology LLC

    Inventor： Daniel Joseph Klemme ,  Walter R. Eppler

    IPC: G01S7/4913 ,  G01S17/32 ,  G01S17/93

    Abstract: Method and apparatus for generating and processing pulses in a light detection and ranging (LiDAR) system. In some embodiments, an emitter outputs phase modulated continuous wave (PMCW) light sequences encoded with a selected encoding scheme such as a pseudo-random bit sequence (PRBS). An analog processing circuit processes reflected light sequences from a target illuminated by the PMCW light sequences by performing analog extraction of a doppler component and analog encoding correlation prior to digitalization of the received signal. The analog processing circuit can include a plurality of demodulation stages each multiplying the input signals by positive and negative magnitudes of a scalar value at times corresponding to signal transitions of different associated doppler clock frequencies. A threshold circuit applies suitable thresholding, after which the signals can be digitized by an analog-to-digital converter (ADC) for further processing in the digital domain to obtain range information associated with the detected target.

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