Cross coupled digital NAND gate comparator based flash ADC

This paper demonstrates the Flash ADC which is constructed using digital 3-input cross coupled NAND gates. These cross coupled configuration of NAND gates form a comparator of flash ADC. It is latch comparator which operates on single phase clock Φ. The output of comparator is thermometer code. An encoder is constructed that encodes the thermometer code to binary as output of comparator. The design is simulated in 180nm technology and implement 4 bit flash ADC version. The Flash ADC is designed in TANNER S-EDIT 13.0.