Patent ID: 6420914
Filing Date: 2002-07-16
Classification: H02M,H03L

Abstract:
A charge pump circuit comprising:a first current source transistor; a first switching circuit for receiving a first control signal and electrically connecting a source electrode of said first current source transistor to a first voltage source for supplying a charge current from said first voltage source to an output terminal when said first control signal is in an active level, and for electrically connecting said source electrode of said first current source transistor to a second voltage source for cutting off said charge current when said first control signal is in an inactive level; a second current source transistor; and a second switching circuit for receiving a second control signal and electrically connecting a source electrode of said second current source transistor to a third voltage source for discharging a discharge current from said output terminal to said third voltage source when said second control signal is in an active level, and for electrically connecting said source electrode of said second current source transistor to a fourth voltage source for cutting off said second current source transistor when said second control signal is in an inactive level.