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I design a filter using Matlab hdl coder. But the problem is filter doesn't give filtered output. When I do the simulation in matlab filter works perfectly, but when I test with modelsim filter is not giving the filtered output. Problem is with the way of resetting and enabling the filter...
I need to convert a simple floating point function to fixed point in order to generate hdl code. Following is the function.
function y = fun(u)
%#codegen
if(u<0)
y=0;
else
y=u;
end
How to convert this function to fixed point. Please help me.
Thanks FvM, for you reply. What is the more practical variable sample rate reconstruction algorithm which is easy to implement in fpga. Can you give me an example.
As you told before I need to interpolate the data in order to reconstruct the data.Interpolation is the inverse of decimation. That...
permute, I got what you say.But according to my knowledge I feel something like this.
As you say within the 1us time intervals we get 20 or 21 for 10.7MHz signal. for 2MHz signal we get 4 zero crossings. Am I correct? Then the IF frequency of the signal is 10.7MHz which has a 150kHz bandwidth...
Thanks for all the replies.
Variable sample rate means the sample data is coming in non constant (non regular) time intervals.
I can't understand what you explained above. Can you explained it further.
Dan Mills, As you explained above your method is worked with high sample rate. The if...
I implement a Zero crossing detector in a fpga. It can detect the zero crossings of a signal and it could successfully demodulate a FM modulated signal. The problem is the demodulated signal doesn't have a fixed sample rate,Because when a zero crossing is met counter will start. when the other...
godfreyl, as you told voltage at the ADC input is 2.5V. But ADC value shows 4.5V. What should be the minimum current input to the AD9280 IC? Datasheet shows that the typical input resistance 4.2k to 10k what is that? AS I went through the data sheet I found that the input resistance of the AIN...
I notice another different thing: My development board has a voltage display function through ADC. When I connect the ADC to 5v it display 5v ,when connect it to a ground it display 0V.When I create a voltage divider using two series 1k resistors and measure the value it display 4.5V . Is it due...
I am using this in a development board so no need to give the reference voltage to IC because the development board it self has a configuration as follows.
What are the other things I need to do in order to get the original signal from DAC?
Thanks, Audioguru for your reply . So what kind of configuration is it accept. Dose it support the following arrangement?
Here is the enlargement version of my ADC schematic.
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