A current-mode CMOS loser-take-all with minimum function for neural computations

A novel architecture for loser-take-all functions is proposed. Inputs and outputs of the circuit are currents, which make the circuit appropriated for low-voltage neural hardware computation. In contrast to most existing realisations the circuit does not require subtraction from a fixed reference which decreases accuracy and input dynamic. Moreover, in addition to the loser, it also outputs the minimum input current. The circuit was synthesized using a SOI (silicon on insulator) technology and optimised to work with 1.5 V voltage supply showing improved speed and accuracy for a very low power consumption (typically 5 μW per cell when the input current is 1 μA)