Capacitance mismatch calibrating circuit and calibrating method applied to single-end SAR ADC
A capacitance mismatch and calibration circuit technology, which is applied in the field of SAR ADC calibration, can solve the problems of establishment time limit, power consumption increase, chip cost increase, etc., and achieve the effects of saving power consumption and area, calibrating dynamic errors, and being easy to implement
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[0044] The present invention will be further explained below in conjunction with the drawings.
[0045] The present invention proposes to calibrate the capacitor array based on a single-ended 14bit binary redundancy, and calibrate the capacitor array to improve the accuracy of the ADC. Because the present invention is based on redundant capacitance calibration. Therefore, the redundant capacitance calibration of the single-ended SAR ADC is explained first.
[0046] figure 1 Redundant calibration operation process for single-ended SAR ADC. It can be seen from the figure that the operation process of its non-redundant bits is exactly the same as that of a normal single-ended SAR ADC. And when switched to redundant bit C jr+ And C jr- , First check the C before the redundant bit j Make a judgment, if bj is 1, then enter the branch of positive compensation, namely Cjr+; if bj is 0, enter the branch of negative compensation, namely Cjr-. When entering the positive compensation branc...
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