通常,稳压器的取样电路是跨接在负载两端的。假定稳压器的输入电压为V_i,,输出电压为V_0,则V_0跟随V_i同向变化。ΔV_0/ΔV_i是一个正值,它反比于电路的放大倍数,而不等于零。其所以不能达到零值,是因为取样电路只接在输出端。当输入电压变化时,如果假定输出电压不变化,这时,取样电路得不到输入 Normally, the voltage regulator’s sampling circuit is connected across the load. Assuming that the regulator’s input voltage is V_i and the output voltage is V_0, V_0 follows V_i in the same direction. ΔV_0 / ΔV_i is a positive value that is inversely proportional to the magnification of the circuit, not equal to zero. So it can not reach zero, because the sampling circuit is only connected to the output. When the input voltage changes, assuming that the output voltage does not change, then the sampling circuit can not be input