Patent ID: 8138821
Filing Date: 2012-03-20
Classification: H02M

Abstract:
1. A high voltage pumping circuit comprising: a first pumping circuit including a precharge circuit configured to precharge a first node, a first swing width controller configured to receive a first inputted pumping signal having a first swing width and output a first pumping signal having a second swing width for pumping of a voltage of the first node when a supply voltage is lower than a predetermined reference voltage, and a first swing width holding device configured to maintain a swing width of the first node to be equal to that of the first pumping signal from the first swing width controller; a second pumping circuit including a first precharge device configured to precharge a second node in response to a signal from the first node, a second swing width controller configured to receive a second inputted pumping signal having the first swing width and output a second pumping signal having the second swing width for pumping of a voltage of the second node when the supply voltage is lower that the predetermined reference voltage, and a second swing width holding device configured to maintain a swing width of the second node to be equal to that of the second pumping signal from the second swing width controller; and a first transfer device configured to transfer the voltage of the second node in response to a first transfer control signal which is distinct from a signal at the second node, wherein the second swing width is larger than the first swing width.