Patent ID: 7170790

Claim:
A sensing circuit for sensing currents, comprising: a measure circuit branch, having a measure node for receiving an input current to be sensed, for converting the input current into a corresponding input voltage; at least one comparison circuit branch, having a comparison node for receiving a comparison current, for converting the comparison current into a corresponding comparison voltage; at least one voltage comparator for comparing the input and comparison voltages; and means for generating the comparison current based on a reference current, the means comprising: at least one voltage generator for receiving the reference current and for generating a corresponding sense amplifier biasing voltage; and means for converting the sense amplifier biasing voltage into the comparison current, wherein the at least one voltage generator includes: a first circuit branch, having a first node for receiving the reference current, for converting the reference current into a corresponding reference voltage; a second circuit branch, having a second node for receiving a regulation current, in current mirror configuration with the first circuit branch for mirroring a current corresponding to the reference current, the second circuit branch generating by conversion a non-regulated voltage corresponding to the mirrored current and to the regulation current; and voltage regulator means receiving the reference voltage and the non-regulated voltage for regulating the sense amplifier biasing voltage by controlling the non-regulated voltage through the regulation current.