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专利名称：ANALOG TO DIGITAL CONVERSION CIRCUIT
AND METHOD
发明人：FAN, Shuo申请号：EP17902662申请日：20170330公开号：EP3432476A4公开日：20190529
摘要：The present application provides an analog-to-digital conversion circuit andmethod. At a sampling stage, the first capacitor array is configured to connect lowerelectrode plates of N capacitors in the first capacitor array to a first input voltage,connect lower electrode plates of the other capacitors in the first capacitor array to acommon-mode voltage, and connect upper electrode plates of all the capacitors in thefirst capacitor array to the common-mode voltage to sample the first input voltage,wherein N is a positive integer less than the total number of capacitors; in an i th
conversion at a conversion stage, the logic circuit is configured to control, according to ani th stored flag bit, the lower electrode plate of an i th capacitor in the first capacitorarray to connect to a reference voltage or a ground voltage, such that a first comparisonvoltage output by the first capacitor array approximates a second comparison voltage,wherein i is a positive integer less than the total number of capacitors; and thecomparator is configured to store a comparison result between the first comparisonvoltage and the second comparison voltage to an i+1 th flag bit in the logic circuit, andanalog-to-digital conversion is completed when i+1 is equal to the total number ofcapacitors in the first capacitor array. According to the present application, a dynamic
range of analog-to-digital conversion is expanded without changing the value of thereference voltage.
申请人：Shenzhen Goodix Technology Co., Ltd.
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