| 摘要 |
<p>A low-dropout voltage (LDO) regulator that creates a zero in the open loop gain using a relatively small-sized current control element to divert part of the supplied load current through a "zero" resistor before adding it to the output load. The main part of the output load is passed through a relatively large second current control element, and both the current control elements are controlled by a control signal generated by an error amplifier (e.g., an op-amp). The voltage signal developed across the "zero" resistor mimics the magnitude and phase of a zero in the loop. This voltage signal is added to the loop gain by, for instance, using a bypass capacitor, and the resulting feedback signal is supplied to the error amplifier, which generates a control signal by comparing the feedback signal with a stable reference voltage.</p> |
