负反馈的最重要作用在于使放大器总增益不至于因基本放大器增益的改变而变化，其总增益的大小完全取决于反馈网络的元件参数。
The most important effect of this is to make the overall amplifier gain almost immune to changes in the amplifier unit gain, and dependent almost entirely on the feedback network components.
采用电压瞬时值反馈降低了输出电压波形的总谐波量。
The total harmonic distortion (THD) can be reduced by the instantaneous voltage feedback control.
反馈靶控组异丙酚总剂量低于靶控输注组（P<0.01），单位标准化剂量亦较低（P<0.01）；
Total dose of propofol was statistilly lower in the feedback TCI group than that in TCI group (P< 0.01), same was the standardized unit dose of propofol ( P< 0. 01).
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