Patent ID: 8159380
Filing Date: 2012-04-17
Classification: H03M

Abstract:
1. A continuous-time sigma-delta analog-to-digital converter for converting analog signals belonging to a chosen bandwidth into digital signals according to a signal transfer function, said converter comprising: a signal path including at least one combiner adapted to combine analog signals to be converted with analog feedback signals, at least one integrator adapted to integrate said combined analog signals, a quantizer adapted to convert said integrated signals into digital signals, a feedback path comprising at least a digital-to-analog converter adapted to convert said digital signals outputted by said quantizer into analog feedback signals intended for said combiner, and at least one non-invasive filter associated with said integrator, coupled in parallel to said signal path at a chosen location and arranged to introduce a notch into said signal transfer function by suppressing unwanted analog interference signals having a chosen frequency band that corresponds to said notch, and said feedback path comprises at least one analog weighting means adapted to convert said analog feedback signals into weighted analog feedback signals intended for said combiner.