Interpolation filters in delta-sigma DACs
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چکیده
1 Motivation and specification.............................................................................................. 2 2 Implementation of interpolation filters for audio DACs.................................................... 4 2.1 Interpolator filter partitioning..................................................................................... 4 2.2 Interpolator filter structures........................................................................................ 7 2.3 Coefficient quantization ........................................................................................... 10 2.3.1 Fixed-point vs. floating-point arithmetic ......................................................... 11 2.3.2 Consequences of coefficient calculations ........................................................ 12 2.3.3 Error-shaping of the coefficient quantization error.......................................... 14 2.4 Coefficient sharing ................................................................................................... 15 2.5 Filter implementation strategies ............................................................................... 16 2.5.1 Direct implementation...................................................................................... 16 2.5.2 MAC implementation....................................................................................... 17 2.5.3 Distributed arithmetic implementation............................................................. 18 3 Transient response: The hidden distortion? ..................................................................... 19 4 References ........................................................................................................................ 22
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