Patent ID: 9304526
Filing Date: 2016-04-05
CPC Classification: G05F,H03K

Claim Text:
1. A reference voltage generating device, configured to receive a power voltage and generate a reference voltage, the reference voltage generating device comprising: a reference voltage source, having an output terminal generating the reference voltage; a charge supplying source, connected to the power voltage; a first switch, having a first terminal coupled to the reference voltage source; a second switch, having a first terminal coupled to the charge supplying source; a charge storage unit, coupled to a second terminal of the first switch and a second terminal of the second switch that is served as an output terminal of the reference voltage generating device, the charge storage unit configured to store charges and generate an output voltage at the output terminal of the reference voltage generating device; and a logic unit, receiving the reference voltage, the output voltage and a power on reset signal to control the first switch and the second switch, wherein when the power on reset signal is received, the first switch is turned off and the second switch is turned on, such that the charge supplying source charges the charge storage unit, and when the output voltage is greater than or equal to the reference voltage, the first switch is turned on and the second switch is turned off, such that the reference voltage source maintains the output voltage to the reference voltage.