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在灵敏的直流电压放大器中,关键的判断标准是输入电压的漂移。为了尽可能地减小漂移,或者是把输入级构成只能在某种程度上达到的极为对称的形式;或者是采用振动变流原理。然而,即使在这种情况下,漂移的消除也只能是有限的。特别是通过输入开关经容性传输的开关脉冲边沿对剩余漂移最敏感。因此,不能随意提高振动变流频率;即是说,在应满足的漂移条件中,对于振动变流频率以及带宽而言,都有一个上限问题。现在,提出颇有希望减小漂移的另一种可能性。
In a sensitive DC voltage amplifier, the key criterion is the drift of the input voltage. In order to reduce the drift as much as possible, or to form an input stage that can only be achieved to some extent in an extremely symmetrical form, or the principle of vibration commutation is used. However, even in this case, the elimination of drift can only be limited. In particular, the edge of a switching pulse that is capacitively transmitted through the input switch is most sensitive to residual drift. Therefore, the frequency of vibration commutation can not be increased arbitrarily; that is to say, there is an upper limit problem for the frequency of vibration commutation and the bandwidth in the drift conditions that should be satisfied. Now there is another possibility that there is considerable hope of reducing drift.