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  1. farrokhiyan

    STM32- F103 model I2C different result in Debugger vs Run

    Hi friends, I'm working on data exchange between my stm32-F103 and atmel AT24C02 serial EEPROM on my starter board. I have did the programming based on I2C peripheral and DMA. the pull ups are 4.7 k. when I debug the program the result is fine and the data inside the EEPROM come out but when I...
  2. farrokhiyan

    question on telephone line interface circuit

    Dear friends, the below image shows the line interface of a dial up modem. the DC loop, ring detector, isolation transformer and hook relay are clear. the question is what does the RC circuit (shown in red) do? when modem is not in operation and a ring signal comes, don't you think the high AC...
  3. farrokhiyan

    autocorrelation of two signals

    autocorrelation dear freinds, what is your evaluation from this autocorrelations of two signals. the important for me is the amplitude of the noisy samples between the repeated samples. neglecting the high amplitude repeated samples, can i suppose it a random signal? what about this...
  4. farrokhiyan

    I/O Buffer (IOB) vs. Global Clock I/O Buffer (GCLKIOB)

    clock_dedicated_route Hi all, Would you please tell me what is the difference between standard I/O Buffer and Global Clock I/O buffer? how can i explicitly instantiate an I/O Buffer component for each top-level I/O signal in xilinx ISE? tnx.
  5. farrokhiyan

    Looking for Accurate VHDL-based simulation of Σ&amp

    Need IEEE Paper Hi all, Would you please send me this paper: Accurate VHDL-based simulation of ΣΔ modulators Castro-Lopez, R.; Fernandez, F.V.; Medeiro, F.; Rodriguez-Vazquez, A. Circuits and Systems, 2003. ISCAS apos;03. Proceedings of the 2003 International Symposium on Volume 4, Issue ...
  6. farrokhiyan

    need a simple source code

    Hi all, I'm a beginner in vhdl. i need a simple source code for digital integrator in vhdl which is synthesizable on FPGA. can you help me? tnx.
  7. farrokhiyan

    Need formula for sigma-delta modulator

    Hi, I need a formula of sigma-delta modulators, which makes relation between these parameters: 1- Input signal Amplitude, 2- Order of modulator, 3- Number of levels of the Quantizer, 4- OSR thanks in advance
  8. farrokhiyan

    Data converters SNR Calculation

    snr calculation Hi all, Can anyone provide me the methodology for Delta Sigma ADC/DAC SNR measurement in simulation? I used SD Toolbox from Mathwork, but i didn't get the true answers. i'd like to measure SNR for some DC input signals. would you please help me to know the principle of SNR...
  9. farrokhiyan

    Help on this Block of SDtoolbox

    Hi, could you tell me what is this block in SDtoolbox,please? is it as same as a quantizer? how does it work? what is the DAC and ADC output lines? what is the usage of ADC line in an all-digitall sigma-delta modulator modeling? how can i use this block? especially in determinig the N-ADC...
  10. farrokhiyan

    How to restore audio signal with MATLAB ?

    audio restoration Hi dear friends, I need to know something about signal restoration. i have some distorted audio samples by severly filtering and background noise and i need to restore them by matlab. can anyone help me to know about common practical methods that exsist. can the LPC method for...
  11. farrokhiyan

    Sigma Delta Matlab toolboxes differences

    delta matlab Hi, I need delta-sigma modulators simulation . I downladed 3 different toolboxes from matlab file exchange center. but i don't know what differences they have. they are : SDtoolbox, delsig, Sigma_Delta. can you say me their differences and which of them can help me?

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