Vcm-based ultra-low power consumption SAR ADC switch switching structure and switch switching method thereof
A switching and ultra-low power consumption technology, which is applied in the field of ultra-low power consumption SARADC switching structure, to achieve the advantages of switching power consumption of capacitor arrays, saving power consumption, and good ADC accuracy
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[0024] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.
[0025] The present invention provides a Vcm-based ultra-low power consumption SAR ADC switching structure, including a first capacitor array, a second capacitor array, a comparator, 2 switching switch groups, and 2 sampling switches. The first capacitor array , The second capacitor array is composed of binary weight capacitance value C 0 、C 0 , 2C 0 ……2 N-1 C 0 Composed of N+1 capacitors, the first switch group and the second switch group both include N+1 switches, and the top plates of all the capacitors in the first capacitor array are connected as the capacitor top plate DACP of the first capacitor array , the top plates of all the capacitors in the second capacitor array are connected as the capacitor top plate DACN of the second capacitor array. with the common-mode level V cm connection, the bottom plates of the capacitors wit...
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