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Method of gain calibration in a successive approximation register analog-to-digital converter and a successive approximation register analog-to-digital converter
Method of gain calibration in a successive approximation register analog-to-digital converter and a successive approximation register analog-to-digital converter
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机译:逐次逼近寄存器模数转换器和逐次逼近寄存器模数转换器中的增益校准方法
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摘要
A method of gain calibration in a SAR ADC is disclosed. In one aspect, the method comprises determining a number of bits of an analog input signal (VIN), detecting if a binary code determined from the analog input signal (VIN) matches at least one trigger code, using at least one setting code to determine a calibration residue signal (V*RES) and a calibration bit (B*LSB), analyzing a least significant bit of the digital signal (COUT) and the calibration bit (B*LSB), determining an indication of a presence of gain error in the gain module, and calibrating the gain error. As the determination of the calibration bit (B*LSB) requires only one additional comparison, as compared to normal operation, the normal operation does not need to be interrupted. Therefore, the calibration can be done in the background and, as such, can be performed frequently thereby taking into account time-varying changes due to environmental effects.
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机译:公开了一种在SAR ADC中的增益校准的方法。一方面,该方法包括确定模拟输入信号(V IN Sub>)的位数,检测是否从模拟输入信号(V IN Sub>)确定了二进制代码。 )匹配至少一个触发代码,使用至少一个设置代码确定校准残留信号(V * RES Sub>)和校准位(B * LSB Sub>),进行分析数字信号的最低有效位(C OUT Sub>)和校准位(B * LSB Sub>),确定增益模块中是否存在增益误差;并校准增益误差。由于校准位(B * LSB Sub>)的确定仅需要进行一次附加比较,因此与正常操作相比,不需要中断正常操作。因此,可以在后台进行校准,因此可以经常执行校准,从而考虑到由于环境影响而引起的时变变化。
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