---+ Discretization Noise in Digital Active Nulling

Motivation

Matt suggested that we might spread 1 LSB / sqrt(12) over the 12 kHz at which DAN operates, which would lead to extreme levels of digitization noise. Here, I look at the effects of digitization using a toy simulation.

Simulation

For intuition building, I ran a quick simulation of DAN nulling away white noise. In ran all four combinations of continuous/discrete accumulator and high/low dan gain (integral control coefficient).

Fig. 0: Block Diagram of the simulation

Plots are shown below. It seems that there white noise floor due to the discretization at the accumulator.

Fig. 1: Continuous Accumulator at low DAN gain

Fig. 2: Continuous Accumulator at high DAN gain

Fig. 3: Discrete Accumulator at low DAN gain

Fig. 4: Discrete Accumulator at high DAN gain

-- TijmenDeHaan - 16 Jul 2010

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