| 摘要 |
A compensation circuit for introducing a zero in a first circuit being incorporated in a closed loop feedback system includes a first capacitor, an amplifier and a second capacitor, connected in series between an input node and a summing node in the first circuit. In one embodiment, the summing node is coupled to a summing circuit disposed between two gain stages of an error amplifier in the first circuit. In another embodiment, the summing node is coupled to the output node of the error amplifier. The amplifier amplifies the capacitance of the second capacitor to introduce a zero in the first circuit having effectiveness over a wide frequency range. The compensation circuit can be applied to a switching regulator controller for adding an effective zero in the feedback system of a switching regulator for compensating a double-pole introduced by a LC filter circuit in the switching regulator feedback system.
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