each of the two detectors r 1 and r 2 causing the result of the combination v o to be an estimation of the peak value of v i that is more accurate i e more linear and less sensitive to the crest factor said combined signal v o is compared with a reference voltage v ref by a comparator block comp the output of which v comp is at a high potential if the mean value of v o exceeds v ref in particular the function of the combiner block f can be simply obtained as represented in fig4 in which the components that are identical to the ones represented in fig3 are designated by the same reference numbers in particular the combiner block f of fig3 as represented in fig4 comprises a subtractor node s 1 which receives at input the two voltages v o1 and v o2 an amplifier stage gain which amplifies by a factor n and is supplied by the difference signal v diff at output from the node s 1 and an adder node s 2 which receives at input the output of the first detector v o1 and the output of the amplification stage the output v o of the adder node s 2 is equal to v o v o1 n v o2 u2212 v o1 following for simplicity the diagram of fig4 the principle of operation is now described in the particular case where the rectifier elements m 1 and m 2 are two short channel mosfets reference to said components which suffer more from problems of linearity and accuracy in peak detection on account of their more linear transconductance aims at highlighting that the solution described herein can also be applied to other cases by way of example in what.