Low area and high-performance 6-bit MUX based flash ADC for wide band applications

This work presents a design of 6-bit, 1 Gs/s, low power (less than 100 mW), low offset, low area, high resolution, high speed, and flash ADC data converter. To reach these specifications, a high-speed multiplexer, comparator, and encoder are to be designed. A conventional 6-bit flash type converter requires 26 resistors for ladder network and 26 − 1(i.e.63) preamplifiers and comparators resulting in high power consumption, high offset, and large area. To overcome these drawbacks, the proposed multiplexer technology called MUX-based design flash is introduced. It requires 2(N − 2) + 1 number of comparators. For 6-bit resolution, the number of comparators is reduced by about 99.7% as it requires only 17 comparators. This flash design contains the modules of reference two-level ladder network, multiplexer, thermometer code converter encoder. The differential nonlinearity (DNL) and integral nonlinearity (INL) of the proposed design are 0.3 and 0.9. A 6-bit module caries 17 comparators using 1.8 V, 0.13 μm technology in the symica tool, Klayout.