Reconfigurable analog interface for mixed signal SOC

This work discusses the development, modeling and implementation results of a programmable architecture to be employed for analog signals interfacing in mixed-signal SOC. The proposed architecture is able to achieve wide frequency range, covering a large range of applications with constant performance, allied to digital configuration compatibility. The proposed approach utilizes the concept of frequency translation (mixing) and SigmaDelta modulation leading to a fairly constant analog block for an input signal uniform treatment from DC to high frequencies. The interface performance theoretical model is addressed for supporting the design space exploration and also the physical design. An interface prototype using a fourth order continuous time band-pass SigmaDelta modulator is built and characterized validating the proposed performance model. The usage of this interface as a multi-band parametric ADC is presented