Patent ID: 7579846
Filing Date: 2009-08-25
Classification: G11C

Abstract:
1. An offset voltage measuring apparatus comprising: an offset voltage measuring unit including a plurality of measurement nodes having a current variation in response to a first feedback voltage and a second feedback voltage; and an offset voltage amplifying unit to output an output voltage amplified in response to an output signal of the offset voltage measuring unit, to generate and adjust the first and second feedback voltages in response to a change in the output voltage, and to feed back the adjusted feedback voltages to the offset voltage measuring unit, the offset voltage amplifying unit comprises: a switching circuit receiving an external power supply voltage and outputting the output voltage in response to the output signal; a first feedback voltage generator connected between the switching circuit and a ground voltage, and outputting the first feedback voltage; and a second feedback voltage generator connected in parallel with the first feedback voltage generator between the switching circuit and ground, and outputting the second feedback voltage.