NEGATIVE DROP VOLTAGE GENERATOR AND CONTROL METHOD FOR GENERATING NEGATIVE DROP VOLTAGE WITH VOLTAGE DIVIDING/UNITING PART FOR GENERATING BULK BIAS VOLTAGE AND WORD LINE DRIVING NEGATIVE VOLTAGE IN DIFFERENT LEVEL WITH EACH OTHER IN TEST MODE

摘要

PURPOSE: A negative drop voltage generator of a semiconductor memory device and a control method for generating negative drop voltage are provided to generate different level of a negative drop voltage in a test mode, and generate the same level of a negative drop voltage in a normal mode. CONSTITUTION: A negative drop voltage generator of a semiconductor memory device comprises a negative voltage generator(50) having a first output terminal(VBB1) and a second output terminal(VBB2); a voltage dividing/uniting part(100) consisting of a NMOS transistor(NM1) between the first output terminal(VBB1) and the second output terminal(VBB2), for controlling the level of the negative voltage to the same level in a normal mode by being turned on in response to a control signal(MRS), and for controlling the level of the negative voltage to a different level in a test mode by being turned off in response to the control signal(MRS).