Patent ID: 7348807

Claim:
Electric circuit for providing a selection signal being used to select a control value of a control variable which oscillates, at steady state, about a reference value about a first control value and a second control value with a first period duration; said electric circuit comprising: a first differential circuit which provides a first current being dependent on a difference between said first control value and said reference value; a second differential circuit which provides a second current being dependent on a difference between said reference value and said second control value; a first node at which a differential current between said first current and said second current is formed; said differential current forming said selection signal indicating when said first control value or said second control value is to be selected in order to minimize a difference between said reference signal and said control variable; a first current mirror circuit which is connected between said first differential circuit and said first node in order to pass said first current to said first node; and a second current mirror circuit and a third current mirror circuit which is connected in series with said second current mirror circuit; said second and third current mirror circuits being connected between said second differential circuit and said first node in order to pass said second current to said first node.