Successive approximation analog-to-digital converter and capacitance switch switching method

Abstract

The invention particularly discloses a successive approximation analog-to-digital converter and a capacitor switch switching method, in the capacitor switch switching method, only two levels participate in each switch switching process, so that the complexity of a successive approximation logic circuit and a capacitor driving circuit is reduced to a great extent, and meanwhile, energy does not need to be consumed in the previous two switching processes, and a single-side switching method is adopted, so that the consumption of switching energy is effectively reduced. Moreover, the digital-to-analog conversion capacitor array is divided into an MSB capacitor array and an LSB capacitor array which are completely the same, the MSB capacitor array adopts a binary weight split capacitor array form, and the LSB capacitor array adopts a C2C capacitor structure, so that the mismatch of capacitors is reduced, the linearity of the digital-to-analog conversion capacitor array is improved. Comparedwith a traditional binary weighted digital-to-analog converter structure, the digital-to-analog converter and the conversion method have the advantages that the area can be reduced by 75%, and the switching energy consumption can be reduced by 96.89%.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a successive approximation analog-to-digital converter and a capacitance switch switching method. Background technique [0002] Signals in nature such as light, temperature, humidity, etc. are continuous analog signals, while in the electronic world, discontinuous binary digital signals are processed, so the analog-to-digital converter (ADC) is used as an interface between analog signals and digital signals. Bridges convert analog signals into digital signals and are often used in fields such as biomedicine, sensors, and mobile communications. At present, various types of ADCs have been researched and developed, such as SAR ADC, Pipeline ADC, Flash ADC, Sigma Delta ADC, etc. With the rapid development of wireless communication technology, the requirements for ADC power consumption and area are getting higher and higher. Therefore, SAR ADCs with low power consumption,...

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Problems solved by technology

The common-mode voltage offset of the Monotonic scheme is relatively large, which increases the difficulty of comparator design. The Vcm-based, Vcm-based Monotonic and MCS structure switching schemes need to introduce three reference levels for each switching, so that the capacitor drive The circuit is more complex, Tri-level and Hybrid and Vcm-based Monotonic structure switching schemes have higher requirements on the accuracy of the reference level Vcm, and the digital logic is also more complex

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