Quantizer
Libraries:
Mixed-Signal Blockset /
ADC /
Building Blocks
Description
Use the Quantizer block for mid-tread quantizations in delta-sigma modulators with multi-bit and multi-level support and realistic non-ideal modeling. You can model the input/output characteristics as a function of number of bits or number of levels. You can also model various impairments such as offset error, gain error, and INL (integral nonlinearity). The block uses a mid-tread quantization characteristics.
Examples
Open the model quantizer_impairments attached with this example.
model = 'quantizer_impairments';
open_system(model)
The model has two 4-bit Quantizer blocks connected to the same input signal. The quantizer blocks are identical in every way, but one is label Ideal and the other is labeled Impaired. Initially, none of them have any impairments.
Effect of offset error
To observe the effect of offset error only, select Enable offset error option in the quantizer block labeled Impaired and set offset error value to 1 LSB.
set_param([model '/Impaired'],'EnableOffsetError','on', ... 'OffsetError','1')
Run the simulation. Observe how the output shifts because of the offset error.
sim(model);
Effect of Gain Error
To observe the effect of gain error only, deselect the Enable Offset Error option in the impaired model. Select Enable gain error option and set gain error value to 1 LSB.
set_param([model '/Impaired'],'EnableOffsetError','off', ... 'EnableGainError','on','GainError','1');
Rerun the model. Observe how the output shifts due to gain error.
sim(model);
Ports
Input
Output
Parameters
Version History
Introduced in R2026a
