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Suppression of delta-sigma DAC quantisation noise by bandwidth adaptation

In this paper we present a system for adapting the bandwidth of a ΔΣ DAC based on the spectral contents of the input signal. By dynamically adjusting the bandwidth of the converter based on the transitory requirements of the input signal, quantisation noise can be suppressed further in frequency bands that are idle. It is shown how a compression scheme can be exploited to efficiently obtain the spectral information needed. A simulation model of the system is used to quantify the performance gain experimentally. The results obtained from the simulations substantiate the claim of a performance increase that outweighs the complexity incurred by the approach for certain classes of input signals.