Digital self-calibration circuit and method of successive approximation analog to digital converter
An analog-to-digital converter and successive approximation technology, applied in the direction of analog/digital conversion calibration/testing, can solve the problems of increasing design area, reducing design performance, etc., and achieve the effect of reducing delay
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[0049] For ease of understanding, a specific successive approximation analog-to-digital converter is taken as an example to illustrate the digital self-calibration circuit of the embodiment of the present invention. The specific successive approximation analog-to-digital converter is figure 1 As shown; the successive approximation analog-to-digital converter includes a first capacitor array 101, a second capacitor array 102, a calibration capacitor array 105, a comparator (COMP) 103, a control logic circuit (SAR & CALLogic) 104 and a memory (CALMemory) 106. The first capacitor array 102 and the second capacitor array 104 form a weighted capacitor array.
[0050] The output terminal PX of the first capacitor array 101 is connected to the first input terminal of the comparator 103 and is connected to the common mode level VCM through a switch SP, and the output terminal NX of the second capacitor array 102 is connected to The second input terminal of the comparator 103 is connected...
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