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Recent content by himadri_debnath

  1. H

    How to find the minimum no of bits required to express the filter coefficients in fixed point format from Histogram plot?

    I have designed a filter in MATLAB and now I have to convert the filter coefficient in fixed point format from floating point format. For that my professor asked me to find histogram first and then find how many bits I required for fixed point representation. But I am not sure how to find that...
  2. H

    Up-sampling a filter

    So the clock frequency of the filter needs to be n*Fs, right? Signal will come at Fs but the filter is operating at n*Fs. Is it working this way.
  3. H

    Up-sampling a filter

    1. What is the difference between up sampling a signal and up sampling a filter? 2. How a filter is up-sampled practically (not MATLAB command)?
  4. H

    Hardware implementation of long FIR filter

    I have 4 filters. 1st one has 242 taps, 2nd - 97 taps, 3rd and 4th 26 taps each. Total 391 taps. I am actually doing sample rate conversion. Converting it from 44.1 kHz to 48kHz.
  5. H

    Hardware implementation of long FIR filter

    I have designed a multistage FIR filter for my project. Each of these filter has long number of taps. I want to implement it in Verilog but I am finding it difficult to write such a long verilog code. Is there any other shortcut method? I have tried MATLAB hdl coder but it is giving complex...
  6. H

    [moved] Applying a digital sinewave in Xilinx ISE

    I want to apply a digital sine wave of different frequencies as an input to an 64bit register in Verilog (Xilinx ISE). How to do that? Is there any way to generate digital sinewave in Matlab and then apply the data in Xilinx?
  7. H

    Simulink Flash ADC

    Does anyone know how to get the digital output in terms of binary values. The output of this given ADC is in scalar integer form. I want output as binary form so that I can process each bit separately.
  8. H

    FFT simulation of D/A converter

    Yes you are right. But why negative spike? Even if I apply pulses that generate sawtooth wave there may be some frequency where it should give positive spike, right? Please correct me if I am wrong.
  9. H

    FFT simulation of D/A converter

    I applied 8 pulse signal with time periods 12.5ns, 25ns, 50ns, 100ns, 200ns, 400ns, 800ns, 1600ns from bit0 to bit 7 respectively. Duty cycle is 50%. That means every steps of total 256 steps are 12.5ns apart(80 MHz). The spike I am getting at 160 MHz.
  10. H

    FFT simulation of D/A converter

    I am doing FFT simulation of my 8bit D/A converter, but I have very much less idea about FFT. I am attaching the simulation result here. Please tell me if the simulation result is good or bad. By the I am confused about negative spikes. Shouldn't I supposed to get positive spike? Please somebody...
  11. H

    8 bit ADC spice model

    I am actually doing this. I just wanted to check sinusoidal variation and also wanted to compare the DAC output with ADC input
  12. H

    8 bit ADC spice model

    I want to test my 8 bit DAC in LTspice. For that I need to apply 8 bit ADC output. But there are no 8bit ADC in LTspice XVII. Is there any website where I can find spice model for 8bit ADC?
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