Hybrid Continuous-Time/Discrete-Time Cascade ΣΔ Modulators with Programmable Resonation

This paper presents novel architectures of hybrid continuous-time/discrete-time cascade SigmaDelta modulators that combine the benefits of both circuit techniques with programmable noise transfer function resonation and unity signal transfer function in all stages. Both local and inter-stage based resonation topologies are synthesized and compared in terms of their circuit complexity, resolution-bandwidth programmability and robustness with respect to circuit implementation. As an application, a multi-standard case study is presented, targeting 5-14 bit programmable effective resolution within a tunable 100 kHz-100 MHz signal bandwidth.