不要交换使用int和long类型，因为这可能会导致高位数字被截断。
Do not use int and long interchangeably because of the possible truncation of significant digits. For example, don't do this?
详细叙述了高位数字译码器13位DAC的工作原理，并对可变增益放大器作了理论分析。
The principle of the most significant bits digital decoder-13 bits DAC is described in detail, and the gain controlled amplifier is theoretically analysed.
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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