Table-look-up type data weighting balance circuit and dynamic component matching method

Abstract

The invention provides a data weighted averaging circuit, which comprises a table lookup unit and a storage unit. By adopting the mode of the table lookup, the operating speed can be largely increased and the operating delay can't be affected by the degree of the data weighted averaging circuit and the different bit widths of input data.

Description

technical field [0001] The present invention relates to a look-up table type dataweighted average circuit (DWA), which is used in sigma-delta modulator (sigma-deltamodulator) and digital analog converter (digital analog converter), etc. The data conversion system (dataconversion system). Background technique [0002] Generally speaking, to increase the resolution of the sigma-delta modulator, that is, to reduce the quantized noise within the signal bandwidth, there are three commonly used methods: first, increase the oversampling rate (over -sampling ratio, OSR); Second, increase the order of the sigma-delta modulator; Third, increase the resolution of the quantizer, that is, increase the number of bits. Different from the first and second methods, the third method is to directly reduce the overall quantization noise to achieve higher resolution. Using a multi-bit (multi-bit) architecture, the quantizer only needs to have the linearity of the number of bits. The degree is ...

AI Technical Summary

Problems solved by technology

To achieve high linearity, the capacitance C of each digital-to-analog conversion unit S The mismatch (mismatch) between must be extremely low, but this usually requires extremely large capacitance values, which is not feasible in practice

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