Apparatus and method for decoding differential multi-level data with
adaptive threshold control
    1.
    发明授权
    Apparatus and method for decoding differential multi-level data with adaptive threshold control 失效
    用自适应阈值控制解码差分多级数据的装置和方法

    公开(公告)号:US5969646A

    公开(公告)日:1999-10-19

    申请号:US47439

    申请日:1998-03-25

    摘要: An improved decoder for recovering Non-Return-to-Zero Interface (NRZI) digital data from a multiple layer transition (MLT-3) encoded signal in a 100BASE-TX Ethernet (IEEE Standard 802.3u) uses multiple comparators to minimize jitter in the decoded signal. A CMOS-based biasing circuit receives the differential MLT-3 encoded input signals and control signals from a signal amplitude detection circuit. The biasing circuit adjusts for any DC offset, and also generates offset signals based on respective mid-peak voltage values of the respective differential input signals. Four comparators are then used to detect a prescribed edge transition (e.g., a positive edge) coinciding with the respective mid-peak voltage value in the respective signals. The detected edge transitions are then used by edge decoding logic to generate the NRZI bilevel signal.

    摘要翻译: 用于从100BASE-TX以太网(IEEE标准802.3u)中的多层转换(MLT-3)编码信号中恢复非归零接口(NRZI)数字数据的改进解码器使用多个比较器来最小化 解码信号。 基于CMOS的偏置电路从信号幅度检测电路接收差分MLT-3编码的输入信号和控制信号。 偏置电路调整任何DC偏移,并且还基于各个差分输入信号的各个中间峰值电压值产生偏移信号。 然后使用四个比较器来检测与各个信号中的各个中间峰值电压值一致的规定边缘转变(例如,正边沿)。 所检测的边缘转换然后由边缘解码逻辑使用以产生NRZI双电平信号。