公开(公告)号：US08659323B2

公开(公告)日：2014-02-25

申请号：US13250037

申请日：2011-09-30

申请人： Sang-Gug Lee ,  Seungjin Kim

发明人： Sang-Gug Lee ,  Seungjin Kim

IPC分类号： H03B21/00

CPC分类号： H03L7/1976

摘要： A frequency synthesizer includes: a delta sigma modulator that outputs an input value to a sequentially changing digital value; an analog path unit that converts the digital value to an analog value according to a first conversion gain; an accumulator that accumulates a difference between the input and digital values; a digital to analog converter (DAC) that compensates an output value of the accumulator according to a second conversion gain; a correction loop that extracts analog tendency by adding an output of the analog path unit and an output of the DAC and that extracts digital tendency from an output of the accumulator and adjusts the second conversion gain by comparing the analog and digital tendency; and a voltage control oscillator that generates an output frequency by adding an output of the analog path unit and an output according to an adjusted second conversion gain of the DAC.

摘要翻译： 频率合成器包括：ΔΣ调制器，其将输入值输出到顺序变化的数字值; 模拟路径单元，其根据第一转换增益将数字值转换为模拟值; 累加器，其累积输入和数字值之间的差; 数模转换器（DAC），其根据第二转换增益来补偿所述累加器的输出值; 校正循环，通过添加模拟路径单元的输出和DAC的输出来提取模拟趋势，并且从累加器的输出提取数字趋势，并通过比较模拟和数字趋势来调整第二转换增益; 以及电压控制振荡器，其通过将所述模拟路径单元的输出和根据所述DAC的经调整的第二转换增益的输出相加来产生输出频率。

公开(公告)号：US20120306542A1

公开(公告)日：2012-12-06

申请号：US13250037

申请日：2011-09-30

申请人： Sang-Gug Lee ,  Seungjin Kim

发明人： Sang-Gug Lee ,  Seungjin Kim

IPC分类号： H03B21/00

CPC分类号： H03L7/1976

摘要： A frequency synthesizer includes: a delta sigma modulator that outputs an input value to a sequentially changing digital value; an analog path unit that converts the digital value to an analog value according to a first conversion gain; an accumulator that accumulates a difference between the input and digital values; a digital to analog converter (DAC) that compensates an output value of the accumulator according to a second conversion gain; a correction loop that extracts analog tendency by adding an output of the analog path unit and an output of the DAC and that extracts digital tendency from an output of the accumulator and adjusts the second conversion gain by comparing the analog and digital tendency; and a voltage control oscillator that generates an output frequency by adding an output of the analog path unit and an output according to an adjusted second conversion gain of the DAC.

摘要翻译： 频率合成器包括：ΔΣ调制器，其将输入值输出到顺序变化的数字值; 模拟路径单元，其根据第一转换增益将数字值转换为模拟值; 累加器，其累积输入和数字值之间的差; 数模转换器（DAC），其根据第二转换增益补偿所述累加器的输出值; 校正循环，通过添加模拟路径单元的输出和DAC的输出来提取模拟趋势，并且从累加器的输出提取数字趋势，并通过比较模拟和数字趋势来调整第二转换增益; 以及电压控制振荡器，其通过将所述模拟路径单元的输出和根据所述DAC的经调整的第二转换增益的输出相加来产生输出频率。