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    • 5. 发明申请
    • ALL DIGITAL PHASE LOCKED LOOP WITH CONFIGURABLE MULTIPLIER HAVING A SELECTABLE BIT SIZE
    • 具有可选位数的可配置乘法器的所有数字相位锁定环
    • US20160049946A1
    • 2016-02-18
    • US14461098
    • 2014-08-15
    • TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY, LTD.
    • Chia-Chun LIAO
    • H03L7/081G04F10/00
    • H03L7/0991G04F10/005H03L7/0812H03L7/085H03L2207/50
    • An all digital phase locked loop comprises a time-to-digital converter and a configurable multiplier. The time-to-digital converter is configured to output a digital code based on a phase difference between a reference clock signal and a variable clock signal. The configurable multiplier is coupled with the time-to-digital converter. The configurable multiplier has a selectable bit size. The selectable bit size is based on a defined minimum number of bits to obtain a reciprocal of a variable clock period. The minimum number of bits is based on a comparison of a first number of bits of a divisor with a second number of bits of a quotient. The time-to-digital converter is configured to multiply the digital code by the reciprocal of the variable clock period to output a fractional error correction value.
    • 全数字锁相环包括时间 - 数字转换器和可配置乘法器。 该时间 - 数字转换器被配置为基于参考时钟信号和可变时钟信号之间的相位差来输出数字码。 可配置的乘法器与时间 - 数字转换器耦合。 可配置的乘法器具有可选择的位大小。 可选择的比特大小基于所定义的最小比特数来获得可变时钟周期的倒数。 最小比特数是基于除数的第一比特数与商的第二比特数的比较。 时间数字转换器被配置为将数字代码乘以可变时钟周期的倒数以输出分数误差校正值。