Low-voltage ultralow-power-consumption high-precision comparer of SAR ADC (successive approximation type analog-digital converter)

Abstract

The invention relates to an electronic circuit technology, in particular to a low-voltage ultralow-power-consumption high-precision comparer of an SAR ADC (successive approximation type analog-digital converter). The comparer comprises a pre-amplifier, a renewable latch, a detector, a comparer clock generator and a transmission gate switch, wherein the single renewable latch forms a lower-precision coarse comparer, and the pre-amplifier is cascaded with the renewable latch to form a higher-precision precise comparer. A voltage range is given, when the input voltage of the comparer is out of the voltage range, the precise comparer does not work, and when the input voltage of the comparer is within the voltage range, the precise comparer works. The low-voltage ultralow-power-consumption high-precision comparer has the beneficial effects that the comparers in different precisions are selected to work through detecting the input voltage value of the comparers, so the power consumption of the comparer is reduced under the condition of not influencing the precision of the comparer. The low-voltage ultralow-power-consumption high-precision comparer is applicable to the low-voltage ultralow-power-consumption high-precision SAR ADC.

Description

technical field [0001] The invention relates to electronic circuit technology, in particular to a low-voltage ultra-low power consumption high-precision comparator for SAR ADC. Background technique [0002] The analog-to-digital converter (ADC) is a bridge from analog signals to digital signals in the real world. Some biomedical signals such as electrocardiogram, electroencephalogram, and electromyography need to pass a medium resolution (8-14bits) and sampling rate (1 -1000kHz) ADC to digitize. Successive approximation analog-to-digital converters (SAR ADCs) are well suited for biomedical applications because of their good compromise between energy efficiency, conversion accuracy, and design complexity. [0003] Generally speaking, for SAR ADCs with a resolution of 10 bits or less, a dynamic regenerable latch is usually used as a comparator. However, such comparators are not suitable for higher resolution SAR ADCs such as 12-bit or above due to the large noise of the dyna...

AI Technical Summary

Problems solved by technology

For higher precision measurement requirements, due to the limitation of comparator power consumption, it is often very difficult to achieve nanowatt-level ultra-low power consumption SAR ADC

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