Patent ID: 7193453
Filing Date: 2007-03-20
Classification: H03K

Abstract:
1. A dual loop voltage regulation circuit of power supply chip, comprising: a capacitor arranged at the output end of the voltage regulation circuit to provide a voltage signal; a comparator comparing a first reference voltage signal and the voltage signal so as to output a forward trigger signal or a backward trigger signal; a first switch connected to the output end of the comparator, triggered by the forward trigger signal; a second switch connected to the output end of the comparator, triggered by the backward trigger signal; a first operational amplifier, wherein when the first switch or the second switch is on, the forward input end receives a second reference voltage signal and generates a first drive signal after the operation on the signal from the backward input end of the first operational amplifier; a first transistor switch triggered to be on by the first drive signal so as to provide a current source loop; a third switch connected to the output end of the comparator, triggered by the forward trigger signal; a fourth switch connected to the output end of the comparator, triggered by the backward trigger signal; a second operational amplifier, wherein when the third switch or the fourth switch is on, the backward input end receives the second reference voltage signal and generates a second drive signal after the operation on the signal from the forward input end of the second operational amplifier; and a second transistor switch triggered to be on by the second drive signal so as to provide a current sink loop.