Patent ID: 8698478
Filing Date: 2014-04-15
Classification: G05F

Abstract:
1. A reference voltage generation circuit comprising a reference voltage generation and comparison unit and a drive unit, wherein, the reference voltage generation and comparison unit generates a first reference voltage; an output terminal of the reference voltage generation and comparison unit is connected to the drive unit; an output reference voltage output from an output terminal of the reference voltage generation circuit is input into the reference voltage generation and comparison unit as a negative feedback voltage; after being compared with the first reference voltage generated by the reference voltage generation and comparison unit, the output reference voltage is output from the output terminal of the reference voltage generation and comparison unit to the drive unit; when a power supply voltage of the reference voltage generation circuit is greater than a first turn-on voltage, after being driven by the drive unit, the output reference voltage is output from an output terminal of the drive unit to the output terminal of the reference voltage generation circuit so that the output reference voltage output from the output terminal of the reference generation circuit is stabilized at a level of the first reference voltage generated by the reference voltage generation and comparison unit, wherein, the reference voltage generation circuit further comprises M drive unit candidate circuits connected to the output terminal of the reference voltage generation and comparison unit, wherein, a first drive unit candidate circuit to an M-th drive unit candidate circuit, amongst the M drive unit candidate circuits, correspond to the first turn-on voltage to an M-th turn-on voltage; the first turn-on voltage to the M-th turn-on voltage are gradually stepped down in series; an N-th drive unit candidate circuit amongst the M drive unit candidate circuits is turned on to work when the power supply voltage of the reference voltage generation circuit is less than an N-th turn-on voltage, wherein, the output reference voltage output from the output terminal of the reference voltage generation circuit is input into the reference voltage generation and comparison unit as a negative feedback voltage; after being compared with the first reference voltage generated by the reference voltage generation and comparison unit, the output reference voltage is output from the output terminal of the reference voltage generation and comparison unit to the M drive unit candidate circuits; when the power supply voltage of the reference voltage generation circuit is less than the N-th turn-on voltage, after being driven by at least the N-th drive unit candidate circuit, the output reference voltage is output from at least the N-th drive unit candidate circuit to the output terminal of the reference voltage generation circuit, wherein, wherein the reference voltage generation and comparison unit includes a first transistor and a second transistor connected serially to the first transistor, and the output reference voltage is fed to the gates of the first transistor and second transistor, wherein the drive unit includes a drive transistor, an output of the N-th drive unit candidate circuit is connected to the drive transistor of the drive unit and is output to the second transistor of the reference voltage generation and comparison unit, and wherein any one of the M drive unit candidate circuits is turned on and an output voltage of the turned-on drive unit candidate circuit is fed back to the reference voltage generation and comparison unit and output from the reference voltage generation circuit.