Investigation of a new cascade-of-resonators Σ-Δ converter configuration

In the past, a number of bandpass Σ-Δ a converter configurations have appeared in the literature. Among these, there are two configurations which are of particular practical interest: The cascade-of-integrators and cascade-of-resonators Σ-Δ a converters. This paper is concerned with an investigation of a new cascade-of-resonators bandpass Σ-Δ converter,which combines the main salient features of the latter two configurations. These features include, complementary signal and noise transfer functions, and noise transfer function zeros at real frequencies. The new configuration consists of a single-bit quantizer and N second-order resonators (N second-order resonators and 1 integrator; respectively), leading to a N-th (2N+1-th, respectively) order Σ-Δ converter. The proposed investigation is undertaken in terms of the design of a corresponding sixth-order bandpass Σ-Δ converter satisfying a practical set of specifications.