A digital switching scheme to reduce DAC glitches using code-dependent randomization

A digital switching scheme to reduce glitches and induce code-dependent randomization in digital-to-analog converters (DACs) is presented. The switching scheme is capable of generating a thermometer-like decoded bit sequence from a butterfly network. Due to the reduced switching activity, it mitigates the impact of timing issues, making it suitable for highspeed operation. From behavioral model simulations with a 10-bit current-steering DAC, a linearity improvement in spurious-free dynamic range of about 4 dBc is obtained for 10% amplitude mismatch in the current sources, demonstrating the improvement in linearity without the use of pseudo-random control signals.