公开(公告)号：US09337854B1

公开(公告)日：2016-05-10

申请号：US14828130

申请日：2015-08-17

Applicant: ANALOG DEVICES GLOBAL

Inventor： Dong Chen

IPC: H03M1/66 ,  H03M1/06 ,  H03M1/74

CPC classification number: H03M1/0673 ,  H03M1/687

Abstract: Present disclosure describes an improved mechanism for addressing component mismatch in a DAC. The mechanism is based on carefully selecting the first DAC unit of an ordered sequence of DAC units that are switched on to convert a particular digital value to an analog value. The mechanism benefits from recognition that selecting the first DAC based on a value of a band-limited dither signal, where the band of the dither signal is selected to be sufficiently removed from the band of the signal of interest, allows shifting effects of DAC units mismatch away from the signal of interest in a manner that is easy to implement and control. Because dither signal is not added to the signal of interest, but is only used to control which DAC units are turned on, drawbacks of a traditional dithering method can be avoided while benefiting from the use of dither.

Abstract translation: 本公开描述了用于解决DAC中的组件不匹配的改进机制。 该机制基于仔细选择接通的DAC单元的有序序列的第一个DAC单元，以将特定数字值转换为模拟值。 该机制从识别中获益，基于频带限制抖动信号的值选择第一DAC，其中抖动信号的频带被选择为从感兴趣的信号的频带充分地去除，允许DAC单元的移位效应 以易于实施和控制的方式与感兴趣的信号不匹配。 由于抖动信号未被添加到感兴趣的信号，而是仅用于控制哪些DAC单元被接通，所以可以避免使用传统的抖动方法的缺点，同时受益于使用抖动。

公开(公告)号：US09680423B2

公开(公告)日：2017-06-13

申请号：US13798561

申请日：2013-03-13

Applicant: Analog Devices Global

Inventor： Dong Chen

IPC: H03F1/26 ,  H03F1/32 ,  H03F3/189 ,  H03F3/24 ,  H03M1/06 ,  H03M1/12

CPC classification number: H03F1/3247 ,  H03F1/3258 ,  H03F3/189 ,  H03F3/245 ,  H03F2201/3209 ,  H03F2201/3224 ,  H03F2201/3233 ,  H03M1/0614 ,  H03M1/1245

Abstract: A amplifier system may include a predistorter receiving an input signal to generate a predistortion signal, a first converter receiving the predistortion signal to generate a preamplified signal, a power amplifier receiving the preamplified signal to generate an output signal based on the preamplified signal and the input signal, and a second converter sampling the output signal to generate a feedback signal. The power amplifier may produce a distortion signal at a first frequency, the second converter may sample the output signal using a timing signal with a second frequency that is lower than the first frequency to generate the feedback signal, and the predistorter, based upon the feedback signal, may predistort the predistortion signal to reduce the distortion signal at the first frequency.