Patent ID: 6737841
Filing Date: 2004-05-18
Classification: H02M

Abstract:
A compensation circuit for introducing a zero in a first circuit being incorporated in a closed loop feedback system, said first circuit including a first terminal generating a first voltage for said closed loop feedback system, a feedback terminal for receiving a second voltage from said closed loop feedback system, an input node in said first circuit receiving a feedback voltage corresponding to said second voltage, said input node being coupled to a second circuit, said compensation circuit comprising:a first capacitor coupled between said input node in said first circuit and a first node, said first capacitor blocking out the DC component of said feedback voltage; an amplifier having an input terminal coupled to said first node and an output terminal coupled to a second node; a second capacitor coupled between said second node and a third node between a first gain stage and a second gain stage of said second circuit; and a third capacitor coupled between said first node and said second node; wherein said capacitance of said second capacitor and an input impedance of said second gain stage of said second circuit introduce a zero in said closed loop feedback system at said third node.