Patent ID: 6781425
Filing Date: 2004-08-24
Classification: H03L

Abstract:
A charge pump circuit comprising:a first current source connected to a first node; a second current source connected to a second node; a first transistor connected between the first node and an OUTB node, the first transistor having a gate connected to an UP signal; a second transistor connected between the first node and an OUT node, the second transistor having a gate connected to an UPB signal; a third transistor connected between the OUTB node and the second node, the third transistor having a gate connected to a DNB signal; a fourth transistor connected between the OUT node the second node, the fourth transistor having a gate connected to a DN signal; and an operational amplifier (OP-AMP) connected between the OUT and OUTB nodes; wherein UP and UPB are complementary signals and to produce an UP output current pulse, the UPB signal is asserted, then the UP signal is asserted, and after a predetermined period of time, the UPB signal is unasserted before the UP signal is asserted.