Patent ID: 7982438

Claim:
An integrated electronic device comprising circuitry for controlling the refresh rate of a reference voltage on a sampling capacitor (C samp ) circuitry comprising: a comparator (COMP) having a first input (+), a second input (−)and an output (RF) connected to trigger a refresh of the sampling capacitor (C samp ) when the a voltage at the first input (+) equals a voltage at the second input (−); a first capacitor (C 1 ) having the capacitance of the sampling capacitor (C samp ) and coupled to a first input (+) of the comparator (COMP); a second capacitor (C 2 ) having the capacitance of the sampling capacitor (C samp ) and coupled to a second input (−) of the comparator (C samp ); a first leakage current source (D 1 ) coupled to the first capacitor (C 1 ) for discharging the first capacitor (C 1 ) with a first current (I a ); and a second leakage current source (D 2 ) coupled to the second capacitor (C 2 ) for discharging the second capacitor (C 2 ) with a second current (I b ), wherein the first and second leakage current sources (D 1 , D 2 ) are dimensioned to provide different amounts of leakage currents.