Notch-ΣΔmodulator - Digital RF modulator with ΣΔ based notch filter
The Notch ΣΔ modulator (ΣΔM) is a digital RF modulator,
which uses a modified sigma-delta modulation in order to
minimize unwanted emissions in the most critical frequency
bands. Sigma-delta modulation is classically used to
push the quantization noise to frequencies outside the
signal band, where it can then be removed by filtering.
Thereby, a large signal-to-noise ratio can be obtained in
the signal band despite having a low DA-converter resolution.
However, in mobile radio systems complex and expensive
filters are needed to attenuate the emitted noise
outside the signal band to an acceptable level. The Notch
ΣΔM solves this problem by the integration of a notch filter
in the sigma-delta modulator which reduces the noise in
especially critical adjacent bands. This advantage is
gained at the cost of a slightly increased noise in the adjacent frequency bands. However, this is not critical due to
relaxed requirements at these frequencies.
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