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通常在运放的反馈回路中采用二极管来实现分段线性放大器,当二极管变成正偏压时,它就会有效地接通电阻器,从而改变放大器的闭路增益。这种方法有二个缺点,
Diodes are often used in the op amp feedback loop to implement a piecewise linear amplifier that effectively turns on the resistor when the diode becomes positively biased, altering the amplifier’s closed-loop gain. This method has two disadvantages,