Patent ID: 7015684
Filing Date: 2006-03-21
Classification: G05F,H02M

Abstract:
1. A semiconductor device with a negative voltage regulator comprising: a negative voltage regulator capable of regulating a negative input voltage and outputting a negative output voltage at a first output node, the negative voltage regulator comprising: a driver for adjusting the negative output voltage, the driver comprising a first transistor and a second transistor, a first node and a second output node, wherein the first node is electrically connected with a first voltage source and the second output node is electrically connected with the first output node of the negative voltage regulator; a first operational amplifier comprising a first input end, a second input end and an output end electrically connected with a feedback voltage, a first reference voltage and the first transistor respectively, the first operational amplifier capable of outputting a driving voltage for controlling a current of the first transistor according to the feedback voltage and the first reference voltage; a second operational amplifier comprising a first input end, a second input end and an output end electrically connected with a second reference voltage, the feedback voltage and the second transistor respectively, the second operational amplifier capable of outputting a driving voltage for controlling a current of the second transistor according to the second reference voltage and the feedback voltage; a current source circuit capable of providing the driver a current, the current source circuit comprising two triple-well n-type metal-oxide semiconductor (NMOS) transistors, wherein drains of the two triple-well NMOS transistors are electrically connected with a drain of the first transistor and a drain of the second transistor separately and sources of the two triple-well NMOS transistors are electrically connected with the negative input voltage; a voltage potential divider comprising a first end, a second end and a feedback node, wherein the first end and the second end are electrically connected with a second voltage source and the first output node respectively, and the feedback node is electrically connected with the first input end of the first operational amplifier and the second input end of the second operational amplifier, the voltage potential divider capable of generating the feedback voltage by dividing the potentials of the second voltage source and the negative output voltage and outputting the feedback voltage to the first operational amplifier and the second operational amplifier for adjusting the current of the first transistor and the current of the second transistor and thereby regulating the negative output voltage; an oscillator; a negative pump for negatively charge-pumping the negative input voltage, the negative pump having an input end electrically connected to an output end of the oscillator, and an output end electrically connected with the sources of the two triple-well NMOS transistors; and a voltage detector electrically connected to the negative pump for controlling the negative pump to negatively charge-pumping the negative input voltage when the negative input voltage in higher than a predetermined voltage.