Reshuffled Diagonal Rotated Walk Switching Scheme for DAC INL Reduction

Abstract

This brief proposes a new switching scheme without division of weighting elements into several parts for unary digital-to-analog converters. The switching scheme is universal, i.e., it can be applied to a unary array with an even resolution of 4 bits and higher. A comparison of universal switching schemes showed that the proposed switching scheme reduces the maximum integral nonlinearity by 12–44% relative to the best-known one, the $\text{Q}^{N}$ Rotated Walk. Moreover, the proposed switching scheme gives an improvement of up to 50% in a comparison with non-universal switching schemes.