International Conference on Microelectronics, Circuits and Systems (MICRO-2014) 1 A High Speed CMOS Current Comparator in 90 nm

In this paper a current mode comparator is presented, more aptly can be called as the "Current Comparator". The proposed circuit consists of a current differencing stage which accepts two current inputs where one is the reference current and the other is the input current. The comparator stage outputs a rail-to-rail voltage depending on the difference of the two currents. Simulation of the proposed design is carried out in Cadence using EDA tool in 90nm technology. The operating speed of the current comparator was found to be 1.82GHz with an average power dissipation of 122µW. The high speed operation was confirmed by the transient analysis results in which the delay was found to be 0.55ns at an input current difference of ±1µA. Keywords: Current comparator, input current, current mode circuits, positive feedback, reference current 1