Method for controlling SAR ADC level switch through hybrid capacitor flipping technology

Abstract

The invention discloses a method for controlling an SAR ADC level switch through the hybrid capacitor flipping technology. The method is characterized in that (1), an input signal is sampled through the upper plate sampling technology; (2), after a comparator is compared for the first time, the capacitor array simultaneous flipping technology is employed, and a capacitor array switch is switched;(3) in the subsequent conversion process, the multi- level switch technology is employed, and the capacitor array switch is switched according to the comparison result until conversion is completed. The method is advantaged in that the proposed hybrid capacitor flipping technology consists of the upper plate sampling technology, the capacitor array simultaneous flipping technology and the multi-level switch technology, the conversion speed is improved through the technology, the number of capacitors in the differential capacitor array is reduced, and energy required for the conversion processis reduced.

Description

technical field [0001] The invention belongs to the technical field of electronic physics, and further relates to a method for controlling the level switch of a successive approximation analog-to-digital converter SAR ADC (Successive-Approximation-Register Analog-to-digital converter) using a hybrid capacitance flipping technology in the technical field of microelectronics . The invention is a successive approximation analog-to-digital converter (SAR ADC) composed of a sampling switch, a differential capacitor array, a differential capacitor array switch, a comparator and a control logic circuit, and controls the switches in the differential capacitor array of the converter through the mixed capacitor flipping technology. Switching, select the level to be connected from the existing levels according to the switching result of the switch. Background technique [0002] The switching of the capacitor array in the successive approximation analog-to-digital converter (SAR ADC) i...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of the traditional level switching method, such as the slow speed of the level switching process, the large hardware resource overhead, and the large energy consumption of the level switching process, in view of the above-mentioned deficiencies in the prior art, and propose a hybrid capacitor flipping technology Control the SAR ADC level switch method, adopt the upper plate sampling technology to collect the differential analog input level, use the capacitor array simultaneous flip technology when generating the highest digit, and use the multi-level switch technology in the subsequent conversion process; the specifics of this method The steps include the following:

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