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A METHOD OF GAIN CALIBRATION IN A TWO-STAGE PIPELINED SUCCESSIVE APPROXIMATION REGISTER ANALOG-TO-DIGITAL CONVERTER AND A TWO-STAGE PIPELINED SUCCESSIVE APPROXIMATION REGISTER ANALOG-TO-DIGITAL CONVERTER
A METHOD OF GAIN CALIBRATION IN A TWO-STAGE PIPELINED SUCCESSIVE APPROXIMATION REGISTER ANALOG-TO-DIGITAL CONVERTER AND A TWO-STAGE PIPELINED SUCCESSIVE APPROXIMATION REGISTER ANALOG-TO-DIGITAL CONVERTER
A method of gain calibration in a SAR ADC (700) comprising the steps of: determining a number of bits of an analog input signal (V1N); 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, when compared to the 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:一种SAR ADC(700)中的增益校准方法,包括以下步骤:确定模拟输入信号(V 1N Sub>)的位数;以及检测从模拟输入信号(V IN Sub>)确定的二进制代码是否至少与一个触发代码匹配;使用至少一个设置码确定校准残留信号(V * RES Sub>)和校准位(B * LSB Sub>);分析数字信号的最低有效位(C OUT Sub>)和校准位(B * LSB Sub>);确定在增益模块中存在增益误差的指示;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额外的比较,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导致的时变变化。
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