Low power consumption folded interpolating analog-to-digital converter for sharing sub-converters

Abstract

The invention belongs to the integrated circuit technical field, and particularly relates to a low power consumption folded interpolating analog-to-digital converter for sharing sub-converters. The analog-to-digital converter is composed of a track and hold circuit, a reference voltage resistor string, a pre-enlarging circuit, N-grade (N is more than 1) cascade folded circuit, an interpolating circuit, a comparator and a coding circuit. In the invention, according to a part of output of the pre-enlarging circuit and the first N-1-grade folded circuit quantitative information originally provided by a crude converter can be obtained, thus saving power consumption of crude analog pre-processing circuit; and meanwhile all the quantitative results are generated on the same signal channel, thusinhibiting quantitative error between a fine converter and a crude converter. The converter has saved hardware expense and low circuit power consumption.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a low-power-consumption folding and interpolating analog-to-digital converter for suppressing quantization errors between sub-converters of the folding and interpolating analog-to-digital converter. Background technique [0002] A schematic diagram of a commonly used folded interpolation analog-to-digital converter is shown in figure 1 As shown, it is mainly composed of a tracking and holding circuit 10, a reference voltage resistor string 11, a coarse sub-converter 12, a fine sub-converter 13 and an encoding circuit 14, wherein the coarse sub-converter is composed of a coarse sub-preamplification circuit 120 and a coarse sub-comparator The micro converter is composed of a micro preamplifier circuit 130 , a folding circuit 131 , an interpolation circuit 132 and a micro comparator 133 . For an N-bit folded interpolation ADC, figure 2 is a schematic diagr...

AI Technical Summary

Problems solved by technology

This method can effectively suppress the quantization error of coarse sub-converter and fine sub-converter, but it comes at the cost of more hardware overhead and power consumption

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