Analog-to-digital converter and analog-to-digital conversion method
A technology of analog-to-digital converter and comparator, applied in the direction of analog-to-digital conversion, code conversion, instruments, etc., can solve the problems of limiting the accuracy of SARADC analog-to-digital conversion
Pending Publication Date: 2022-04-12
HANGZHOU HIKVISION DIGITAL TECH
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[0003] Among them, the commonly used analog-to-digital converter is a successive approximation register analog-to-digital converter (SAR ADC). The existing SAR ADC includes: a sample-and-hold circuit, a comparator, a controller, and a digital-to-analog conversion In the process of converting an analog signal into a digital signal by the SAR ADC, the four circuit modules of the sample-and-hold circuit, comparator, controller, and digital-to-analog converter need to cooperate with each other, and the precision of the digital-to-analog converter is When 3 bits (bit), the accuracy of the SAR ADC will also be limited to 3 bits, and when the accuracy of the digital-to-analog converter is 4 bits, the accuracy of the SAR ADC will also be limited to 4 bits
The accuracy of the digital-to-analog converter will limit the accuracy of the analog-to-digital conversion of the SAR ADC
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[0025] The following will describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.
[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by one of ordinary skill in the art. In this application, "at least one" means one or more, and "multiple" means two or more. "And / or" describes the association relationship of associated objects, indicating that there may be three types of relationships, for example, A and / or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone, where A, B can be singular or plural. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. Fo...
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The invention provides an analog-to-digital converter and an analog-to-digital conversion method, relates to the technical field of integrated circuits, and can avoid the limitation of a digital-to-analog converter on the analog-to-digital conversion precision of the analog-to-digital converter. In the analog-to-digital converter, a sampling hold circuit samples an analog signal to generate an analog sampling signal; the first-stage comparator is used for generating a first comparison result according to the analog sampling signal and 1 / 2 of the full-scale voltage, and a logic value corresponding to the first comparison result is a numerical value of a first high effective bit of a digital signal corresponding to the analog sampling signal; the nth-stage controller is used for generating a control signal according to the first comparison result output by the first-stage comparator to the nth comparison result output by the nth-stage comparator; and the (n + 1) th comparator generates an (n + 1) th comparison result according to the analog sampling signal and the control signal output by the nth controller, and the logic value corresponding to the (n + 1) th comparison result is the numerical value of the (n + 1) th high effective bit of the digital signal corresponding to the analog sampling signal.
Description
technical field [0001] The present application relates to the technical field of integrated circuits, in particular to an analog-to-digital converter and an analog-to-digital conversion method. Background technique [0002] An analog-to-digital converter (ADC) is used to convert an analog signal into a digital signal. At present, most electronic devices are equipped with analog-to-digital converters. Electronic devices receive analog signals, and use analog-to-digital converters to convert analog signals into digital signals, and then process the digital signals to realize various functions of electronic devices. Features. [0003] Among them, the commonly used analog-to-digital converter is a successive approximation register analog-to-digital converter (SAR ADC). The existing SAR ADC includes: a sample-and-hold circuit, a comparator, a controller, and a digital-to-analog conversion In the process of converting an analog signal into a digital signal by the SAR ADC, the fo...
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IPC IPC(8): H03M1/46
Inventor 王桂玲郑絮文詹天歌
Owner HANGZHOU HIKVISION DIGITAL TECH