Negative drop voltage generator for use in semiconductor memory device and control method for generating negative drop voltage

摘要

semiconductor memory device to produce a level of the negative voltage required in accordance with the operation mode in the semiconductor memory device of the best negative voltage generating device and a control method of a negative voltage generation is described. Negative voltage generating device of such a semiconductor memory device and a negative voltage generator having first and second output terminals ; It is connected between the first output and the second output terminal of the negative voltage generator in response to an applied control signal , so that the negative voltage is generated in each of the different levels through the first and second output terminals to each other or at the same level by a voltage separation / integration unit for generating more stable so that the operation mode is generated according to the effective negative voltage is achieved.