而一个稳定的反馈环路其频率响应必须满足：在单位增益频率（Unity Gain Frequency）之前，相位偏移小于1800。因此三极点一零点系统可能是不稳定的。
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Unity-gain n frequency 单位增益频率
With the ever-increasing data rates, require high accuracy amplifier with very high dc gain and high unity gain frequency in order to meet both accuracy and fast settling requirements of the system.
而随着数据传输速率的增加，在许多方面需要高增益和高带宽的运放去满足系统的精度和速度的要求。
The unity gain buffer will be good for designing high frequency SCF if its resistive effect can be eliminated and then the overall parasitic sensitivity will be greatly lowered.
用单位增益缓冲器构成的开关电容滤波器（SCF），若能消除寄生电容引起的“阻性”寄生，则可用于高频设计，总寄生灵敏度会因此大大降低。
Additional negative feedback is provided to set loop gain to unity at the oscillation frequency, to stabilize the frequency of oscillation, and to reduce harmonic distortion.
为了使振荡频率稳定并降低谐波失真，需要加入一个在震荡频率处能够提供单位增益的负反馈路径。
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