The single-end connection is useful when a signal is referenced to ground.
当信号值是相对地而言的，则使用单端连接。
All amplifiers are differential in that they are referenced to ground somewhere.
由于参考地不同，所有的放大器都是有差异的。
All amplifiers are differential in that they are referenced to ground somewhere.
由于参考地不同，所有的放大器都是有差异的。
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