Patent ID: 7130225
Filing Date: 2006-10-31
Classification: G11C,H03L

Abstract:
1. A charge pump including a first current source and a second current source connected in series between a high voltage source and a low voltage source, the charge pump comprising: a PMOS transistor functioning as the first current source, a source of the PMOS transistor being connected to the high voltage source and a gate of the PMOS transistor being selectively connected to the high voltage source; a first capacitor connected to the high voltage source and selectively connected to a gate of the PMOS transistor; a first bias generator for charging the first capacitor; an NMOS transistor functioning as the second current source, a source of the NMOS transistor being connected to the low voltage source, and a drain of the NMOS transistor being connected to a drain of the PMOS transistor, and a gate of the NMOS transistor being selectively connected to the low voltage source; a second capacitor connected to the low voltage source and selectively connected to a gate of the NMOS transistor; and a second bias generator for charging the second capacitor, wherein the first and second bias generators include a current mirror circuit, wherein the current mirror circuit includes: