Novel high-precision capacitor self-calibration analog-to-digital converter of successive approximation type
An analog-to-digital converter and successive approximation technology, applied in the field of microelectronics, can solve the problems of high cost of laser correction technology, inaccurate calibration parameters, and mechanical stress effects, and achieve the effects of reducing errors, reducing power consumption, and improving accuracy
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[0025] The present invention will be described in detail below through embodiments.
[0026] In the present invention, the high-precision SAR ADC works in two modes: self-calibration mode and analog-to-digital conversion mode. The two working modes share a comparator.
[0027] The self-calibration mode of the high-precision SAR ADC can be divided into two stages, namely the reset stage and the adjustment stage. In the reset phase, the sampling switch SH is closed to eliminate the offset error at the input of the comparator. Then enter the adjustment phase: turn off the sampling switch SH. Determine the sampling capacitor C to be adjusted i , From the lowest sampling capacitor C to be adjusted M Start. Initialize the sampling capacitor C to be adjusted i Adjust the capacitor array, select a part of the capacitor as the compensation capacitor Cc i Connect to C i Medium; Use the comparator and switching timing to compare the sum of the sampling capacitor to be adjusted and the low s...
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