DAC capacitor array and analog-to-digital converter, method for reducing power consumption of analog-to-digital converter

Abstract

Embodiments of the present disclosure relate to the technical field of integrated circuits, and in particular, relate to a DAC capacitor array, an analog-to-digital converter, and a method for reducing power consumption of an analog-to-digital converter. The DAC capacitor array includes a plurality of sub-capacitor arrays that are connected in parallel. Each sub-capacitor array includes: a capacitor group, including N capacitors connected in parallel, N being a positive integer; and a primary switch and a plurality of multiplexers; wherein one terminal of each capacitor in the capacitor group is connected to an input terminal of a comparator, and is connected to an input source via the primary switch; and the other terminals of the capacitors in the capacitor group are connected to a plurality of input sources via corresponding multiplexers respectively. The DAC capacitor array is optimized by adjusting the reference voltage to which the capacitors in the DAC capacitor array are connected, which reduces the overall capacitance of the DAC capacitor array. In this way, the size of the SAR analog-to-digital converter is reduced, the power consumption is reduced, and meanwhile the cost of chips may be lowered in manufacture of the chips.

Description

technical field [0001] Embodiments of the present invention belong to the field of integrated circuits, and in particular relate to a DAC capacitor array, an analog-to-digital converter, and a method for reducing power consumption of the analog-to-digital converter. Background technique [0002] The successive approximation analog-to-digital converter (Successive Approximation Analog-to-digital converter, SAR ADC) can convert the analog signal into a digital signal, refer to figure 1 , which is composed of a comparator, a register, and a digital-to-analog converter (Digital-to-analog converter, DAC). The basic principle of converting an analog signal into a digital signal is: the analog input signal to be converted is compared with a reference signal In comparison, the reference signal is obtained from the output of a D / A converter. According to the size of the two, it is decided to increase or decrease the digital signal input by the D / A converter, so that the reference sig...

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Problems solved by technology

However, if there are too many capacitors arranged in a binary weighted arrangement, the overall capacitor size will be too large, which will increase the power consumption of the circuit, and even offset the power consumption of the circuit reduced by changing the reference voltage of the unit capacitor on the right.

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