Patent ID: 8860480
Filing Date: 2014-10-14
Classification: G05F,H02M,H03K,H03L

Abstract:
1. A charge pump comprising: a capacitor coupled to an output node; a first input to connect to a first power supply; a second input to connect to a second power supply having a voltage lower than the first power supply; a first bias input to connect to a first bias voltage; a second bias input to connect to a second bias voltage, wherein the first bias voltage is positive relative to the output node, and wherein the second bias voltage is negative relative to the output node; a pump up current path defined by: a pump down current path defined by: a first alternate current path between the first intermediate node and the second input and configured to conduct current for a brief period of time when the first transistor is switched to an off state; and a second alternate current path between the second intermediate node and the first input and configured to conduct current for a brief period of time when the third transistor is switched to an off state.