A design methodology for delta-sigma converters based on solid-state passive filters

Overview & Synopsis

In the context in the ENIAC ARTEMOS project for the design of agile radio front ends, this paper shows a methodology for the design of agile bandpass continuous-time delta sigma based on acoustic tunable resonators. These resonators use BST materials which have the property to be tunable by an external voltage, allowing changing the resonance frequency of filters by a few percent. Using such filters, the Oversampling ratio of delta sigma may decrease as the central frequency of the modulator may be adjusted precisely, allowing the change the band without having to acquire the whole spectrum. Direct RF applications at 2.4 GHz are expected within this project.