| 摘要 |
<p>A low dropout (LDO) voltage regulator comprises a regulating element (10) having an input (12), an output (14) and a control terminal (16), an error amplifier (22) having a non-inverting input (28) coupled to a node (30) of a potential divider sampling an output voltage (Vo) at the output (14) of the regulating element, an inverting input (24) coupled to a source (26) of a reference voltage (Vref) and an output coupled to the control terminal (16) of the regulating element, and means for generating an internal zero. The means for generating an internal zero comprises an operational amplifier (52) having a non-inverting input (54) coupled to the node (30) of the potential divider, an output (58) coupled to the non-inverting input (28) of the error amplifier, a resistive element (60) connected between the output and an inverting input (56) of the operational amplifier and a capacitive element (62) coupled between the inverting input of the operational amplifier and the source of reference voltage.</p> |
