AN EFFICIENT FULLY DIFFERENTIAL VOLTAGE COMPARATOR

With the compactness of the devices, the circuits are required with less delay, less area and less power consumption. An efficient fully digital-in-notion differential voltage comparator with the opamp-less approach is implemented in this paper. This comparator detects a small input voltage difference, i.e., resolution of this comparator is 8-bits and amplifies the output to either of the two different logic levels high or low, i.e., 1 or 0 respectively. Though dynamic latched comparators are quite attractive, they suffer from high power consumption and large offset voltages. In addition to the low power consumption, this comparator is extremely cost-effective as an analogue circuit has been designed digitally and fabricated in a digital process. The comparator is designed and implemented in the Cadence Virtuoso tool using SCL 180 nm Complementary Metal Oxide Semiconductor (CMOS) digital process at a supply of 1.8 V and a load capacitance of 1 pF.