Colored clock jitter model in audio continuous-time ΣΔ modulators

In this paper the effect of colored clock jitter on audio continuous-time ΣΔ modulators is studied. The results demonstrate the importance of using the correct model for the jitter on the clock signal, especially when it is generated by a phase-locked loop, as it is the case in most audio applications. The paper demonstrates that the popular clock signal model with white jitter noise spectrum leads to worse ΣΔ modulator performance than a more realistic model with colored jitter noise spectrum. Indeed, such a model allows the designer to obtain more reliable simulation results, in order to choose the most suitable architecture and size correctly the circuit components to achieve the desired design target, leading to power consumption and area optimization.