第一选择单元依据N位数字信号的M个最高位，由第一组参考电压中选择出两参考电压。
The first selected element selects two voltage references from the first group of voltage references according to m most significant bits of the N-bit digital signal.
第一选择单元依据N位数字信号的M个最高位，由第一组参考电压中选择出两参考电压。
The first selected element selects two voltage references from the first group of voltage references according to m most significant bits of the N-bit digital signal.
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