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The input and output buses of the map represent angle and amplitude values, respectively. But because the buses have finite resolution (P-bits of angle resolution and D-bits of amplitude resolution), the output is by definition quantized. Therefore, consider taking the entire contents of the map, that is, one complete cycle of a sinusoid and calculate its spectrum with an FFT. The resulting spectrum would show the main sinusoidal signal along with a plethora of spurious content, namely quantization spurs. The width of the map’s output bus D defines the amplitude resolution of the map and directly affects the MAGNITUDE of the quantization spurs. On the other hand, the width of the map’s input bus P defines the angle (or phase) resolution of the map, and determines the number of quantization spurs with only limited impact on the magnitude of the quantization spurs.
