# sigma delta modulator bandwidth as noise function

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#### ultralowpower

##### Newbie level 5
Hi,

How to simulate the sigma delta modulator bandwidth as noise quantization function in ELDO or SPICE like simulators?

#### naalald

##### Full Member level 4
Hi ultralowpower,
Az you know for quantization noise we have:

Where He(f) is the NTF, delta2/12 is the total quantization noise and fB is the SD modulator bandwidth. What do you mean by simulating the bandwidth as a function of quantization noise?