  This paper, presents a novel idea for analog current comparison which
compares input signal current and reference currents with high speed, low power
and well controlled hysteresis. Proposed circuit is based on current mirror and
voltage latching techniques which produces rail to rail output voltage as a
result of current comparison. The same design can be extended to a simple
current comparator without hysteresis (or very less hysteresis), where
comparator gives high accuracy (less than 50nA) and speed at the cost of
moderate power consumption. The comparators are designed optimally and studied
at 180nm CMOS process technology for a supply voltage of 3V.
