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SUCCESSIVE APPROXIMATION REGISTER (SAR) ANALOG-TO-DIGITAL CONVERTER (ADC), RADAR UNIT AND METHOD FOR IMPROVING HARMONIC DISTORTION PERFORMANCE
SUCCESSIVE APPROXIMATION REGISTER (SAR) ANALOG-TO-DIGITAL CONVERTER (ADC), RADAR UNIT AND METHOD FOR IMPROVING HARMONIC DISTORTION PERFORMANCE
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机译：逐次逼近寄存器（SAR）模数转换器（ADC），雷达单元和提高谐波失真性能的方法
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摘要
A successive approximation register, SAR, analog-to-digital converter, ADC, (400) is described. The SAR ADC (400) includes: a track and hold circuit (414) configured to sample an analog input signal (410); a comparator (416) coupled to the track and hold circuit and configured to compare the sampled analog input signal (410) with a DAC (444) output voltage; and a feedback path (422) that comprises a digital-to-analog converter, DAC, (444) configured to generate the reference voltage that approximates the input analog signal (410). The SAR ADC (400) further includes a dither circuit (468) coupled to or located in the feedback path (422) and arranged to add a dither signal at an input of the DAC (444) in a first time period and subtract the dither signal from the output digital signal routed via the feedback path (422) and input of the DAC (444) in a second time period during a conversion phase of the SAR ADC (400).
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机译：描述了逐次逼近寄存器SAR，模数转换器ADC（400）。 SAR ADC（400）包括：跟踪和保持电路（414），被配置为对模拟输入信号（410）进行采样;以及比较器（416）耦合到跟踪和保持电路，并配置成将采样的模拟输入信号（410）与DAC（444）输出电压进行比较;反馈路径（422）包括数模转换器DAC（444），该数模转换器DAC被配置为生成近似于输入模拟信号（410）的参考电压。 SAR ADC（400）还包括耦合到或位于反馈路径（422）中的抖动电路（468），该抖动电路被布置为在第一时间段内在DAC（444）的输入处添加抖动信号并减去抖动。在SAR ADC（400）的转换阶段的第二时间段中，来自输出数字信号的信号通过反馈路径（422）和DAC（444）的输入进行路由。
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