a sixth and a seventh NMOS device forming a current mirror, wherein both sources are connected to an output voltage of the boost converter, both gates and {HEAD ~ a drain} of the fifth NMOS device are connected to a first terminal of a second capacitive means and to {TAIL ~ an anode} of a second rectifying means, and the drain of the seventh transistor is connected to a first terminal of a current source and to a first terminal of a flip flop 
a sixth and a seventh NMOS device forming a current mirror , wherein both sources are connected to an output voltage of the boost converter , both gates and { HEAD ~ a drain } of the fifth NMOS device are connected to a first terminal of a second capacitive means and to { TAIL ~ an anode } of a second rectifying means , and the drain of the seventh transistor is connected to a first terminal of a current source and to a first terminal of a flip flop
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