Sensing circuits

Abstract

A current sensing circuit comprising a current amplification stage for amplifying a sensed current input, and a comparator having as a first input the amplified sensed current input. The amplification stage comprises a first transistor connected between a first rail and a second rail, the sensed current being input to a source of the first transistor, the amplified sensed current being output from the drain of the first transistor, and a gate of the first transistor being biased. The circuit is capable of sensing an analogue signal of 100 μA or less and outputting a rail-to-rail digital signal.

Dependencies are inferred from the claim text.