公开(公告)号：JP2002032991A

公开(公告)日：2002-01-31

申请号：JP2000211185

申请日：2000-07-12

Applicant: UNITED MICROELECTRONICS CORP

Inventor： KIM C HARDY

IPC: G11C11/413 ,  H01L21/822 ,  H01L27/04

Abstract: PROBLEM TO BE SOLVED: To provide a reference voltage generator for generating reference voltage being lower than power source voltage by quantity being selected previously. SOLUTION: A reference voltage source generates first reference voltage being higher than a ground potential by VREF. A first load element is coupled to a ground node, and generates an internal reference signal decided by magnitude of a current flowing in the first load element. A differential amplifier generates a signal decided by difference between a first input signal and a second input signal. A current adjusting switch has a control node coupled to an output of the differential amplifier, and it is coupled so that a current flowing in the first load element is decided. A second load element is coupled to the first load element in series and coupled to a power source node, its impedance is selected so that the second load element generates the second reference voltage.

公开(公告)号：JP2002041156A

公开(公告)日：2002-02-08

申请号：JP2000212568

申请日：2000-07-13

Applicant: UNITED MICROELECTRONICS CORP

Inventor： KIM C HARDY

IPC: G05F1/56

Abstract: PROBLEM TO BE SOLVED: To provide a voltage down converter which can be realized by on-chip whose high load performance is improved. SOLUTION: This voltage down converter is provided with a hysteresis generator for combining a hysteresis signal with a reference voltage and an output voltage feedback signal to be applied to a comparator. The hysteresis generator is connected to a control signal for preliminarily announcing when a high current load is activated. The hysteresis signal is switched to a first state before the high current load is activated, and switched over to a second state after the high current load is activated. In the first state, the hysteresis voltage is added to the reference voltage. In the second state, the hysteresis voltage is added to the voltage output feedback signal.