Response to: ADC in Matlab simulink:

The first time I did this I misinterpreted the question, posting a sigma-delta example rather than an integrating (slope) ADC. Anyway, here’s a slope ADC starting point:

Here’s a plot of the input (with an offset) and the integration of the input:

Here’s a plot of the control signal (reset signal on the integrator; active low):

From this, the counter logic should be easy: simply run a counter that resets itself with the control signal. You can pretty much use the integrator inside the ADC itself as a template for this.

I am looking for matlab and simulink code for decimation filter.

The input to the decimation filter is bitstream 11.3Mhz and output should be 16bit at Nyquist rate. Please help me with the code. I have not designed it before.

Thanks,

K.K

Hi, Krishna.

What you’ve stated isn’t fully specified. You say the input is 11.3 MHz, but what’s the output (or signal bandwidth)? What format is the input (PCM, floating point)?

When you say 16-bit, do you mean quantization noise, or aliasing, or both?

I can help you with a procedure, but I don’t have Simulink, so I can’t really give you an end solution.