Sample and hold circuits and methods with offset error correction and systems using the same
    36.
    发明专利
    Sample and hold circuits and methods with offset error correction and systems using the same 审中-公开
    使用偏移校正和校正的系统进行采样和保持电路和方法

    公开(公告)号:JP2008160843A

    公开(公告)日:2008-07-10

    申请号:JP2007328033

    申请日:2007-12-19

    CPC classification number: G11C27/024

    Abstract: PROBLEM TO BE SOLVED: To provide a sample and hold circuit suitable for mixed signal processing.
    SOLUTION: A sample and hold circuit includes a sampling capacitor for storing a sample of an input signal, an output stage for outputting the sample stored on the sampling capacitor, and input circuitry for sampling the input signal and storing the sample on the sampling capacitor. The input circuitry includes an autozeroing input buffer which selectively samples the input signal during a first operating phase and holds a sample of the input signal during a second operating phase. The autozeroing input buffer cancels any offset error. The input circuitry also includes switching circuitry for selectively coupling the sampling capacitor with an input of the sample and hold circuitry during the second operating phase and to an output of the autozeroing input buffer during the first operating phase.
    COPYRIGHT: (C)2008,JPO&INPIT

    Abstract translation: 要解决的问题:提供适用于混合信号处理的采样和保持电路。 解决方案:采样和保持电路包括用于存储输入信号的采样的采样电容器,用于输出存储在采样电容器上的采样的输出级,以及用于对输入信号进行采样并将样本存储在 采样电容器。 输入电路包括自动调零输入缓冲器,其在第一操作阶段期间选​​择性地采样输入信号,并且在第二操作阶段期间保持输入信号的采样。 自动归零输入缓冲器取消任何偏移误差。 输入电路还包括用于在第二操作阶段期间将采样电容器与采样和保持电路的输入有选择地耦合的开关电路,以及在第一操作阶段期间自动调零输入缓冲器的输出。 版权所有(C)2008,JPO&INPIT

    Signal processing using the noise quantization minimization of look-ahead modulator

    公开(公告)号:JP2007518376A

    公开(公告)日:2007-07-05

    申请号:JP2006549595

    申请日:2005-01-13

    CPC classification number: H03M7/3011

    Abstract: 信号処理システムは、各出力候補ベクトルの量子化誤差ベクトルを決定するために複数の出力候補ベクトル(Yi)および入力ベクトル(Xi)を処理するルックアヘッドデルタ・シグマ変調器(500)を含む。 一実施形態において、量子化誤差ベクトルは、コスト値ベクトルと入力候補ベクトルとの間の差を表す。 ルックアヘッドデルタ・シグマ変調器出力値は、例えば、入力ベクトルXごとの最小パワー量子化誤差ベクトルを決定し、最小パワー量子化誤差ベクトルに関連する入力候補ベクトルから出力値を選択することにより、量子化誤差ベクトル(Ci−Yi)を使用して選択される。 量子化誤差ベクトルは、不均一な重みベクトルを使用して重み付けされてもよい。

    Improved fault tolerant sync mark detector for sampled amplitude magnetic recording
    39.
    发明专利
    Improved fault tolerant sync mark detector for sampled amplitude magnetic recording 审中-公开
    改进的容错同步标记检测器,用于采样放大磁记录

    公开(公告)号:JP2007080514A

    公开(公告)日:2007-03-29

    申请号:JP2006340551

    申请日:2006-12-18

    Abstract: PROBLEM TO BE SOLVED: To provide a sync mark detection method that uses information from a preamble and the sign of sampled data in order to further increase the fault tolerance of a sync mark detector.
    SOLUTION: Digital data comprise a preamble field followed by a sync mark followed by a data field. Timing recovery (28) in a read channel synchronizes to a phase and frequency of the preamble field and a sync detector (A120) detects the sync mark in order to frame operation of an RLL decoder (36, A122) for decoding the detected data field. To decrease the probability of early misdetection, the sync mark is chosen to have minimum correlation with shifted versions of the sync mark concatenated with the preamble field. To further increase the fault tolerance, the sync mark detector is enabled by timing recovery relative to the end of the preamble field.
    COPYRIGHT: (C)2007,JPO&INPIT

    Abstract translation: 要解决的问题:提供使用来自前导码的信息和采样数据的符号的同步标记检测方法,以进一步增加同步标记检测器的容错性。 解决方案:数字数据包括前同步码字段,随后是同步标记,后跟数据字段。 读通道中的定时恢复(28)与前同步码字段的相位和频率同步,并且同步检测器(A120)检测同步标记,以便对RLL解码器(36,A122)进行帧操作,以解码检测到的数据字段 。 为了降低早期错误检测的可能性,选择同步标记与与前导字段连接的同步标记的移位版本具有最小相关性。 为了进一步增加容错能力,同步标记检测器通过相对于前同步码字段结束的定时恢复来启用。 版权所有(C)2007,JPO&INPIT

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