Patent ID: 6788133
Filing Date: 2004-09-07
Classification: G05F

Abstract:
A reference voltage providing circuit, comprising:an operational amplifier having a first non-reverse input terminal, a first reverse input terminal and an output terminal coupled to the first reverse input terminal for outputting an output voltage; a reference voltage generator coupled to the first non-reverse input terminal; a loading coupled to the output terminal; a current source for providing a starting current; a switching device coupled between the current source and the output terminal, and turned on by an accelerating charging signal to pass the starting current to the loading through the output terminal; a pulse output device for outputting the accelerating charging signal; and a voltage detection device for detecting the output voltage, outputting an enabling signal to start the pulse output device when the output voltage is lower than a first voltage, and outputting a disabling signal to turn off the pulse output device when the output voltage is higher than a second voltage.