falls off – Chinese Translation – Keybot Dictionary

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An amplifier's loop gain minimizes the distortion that would otherwise result from nonlinearities in its input-to-output transfer function. Because amplifier gain falls off at higher frequencies, the amplifier's harmonic distortion increases.
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因为输入电压噪声、同相电流噪声和R3引起的噪声在整个闭环带宽内积分，并与电流噪声增益相乘，可以看出(根据噪声增益和开环增益图)，通过选择低单位增益交越频率的运算放大器，使电路噪声最小化。对反相输入，由R1和R2引起的电流噪声和热噪声只在信号带宽(1/2ΠR2C2)内积分。因为电流反馈运算放大器中没有电容C2，所以这类运算放大器的噪声只在整个闭环信号带宽内积分。