Cascaded hadamard based parallel ΣΔ modulation

The weakest point in the development of versatile Software Radio is the Analog-to-Digital converter, as very high performance is needed to transform RF or IF signals. Sigma-Delta (ΣΔ) converters are a good approach but they are limited primarily by the stability and the necessary oversampling to achieve a high resolution. In this paper we present a new hybrid ΣΔ converter that, because of the characteristic strengths of each of the modules that comprises it, makes a very attractive architecture to attack these two problems.