A low power analog voltage similarity circuit

In this paper, we present a low power bump circuit for finding similarity between two voltages. The circuit is based on a voltage correlator that in combination with a differential pair achieves the low power behavior. The circuit has low power consumption and low sensitivity when the different between the two input is large, but as they approach each other the sensitivity increases. The proposed circuit is very simple in design and can have more than 4 orders of magnitude less power consumption than the normal bump circuit.