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Found 1 result

  1. Hello, I'm currently trying to implement a simple low-pass filter using the FIR Compiler available in the IP catalog. My design is very basic, I've generated a sine wave using the DDS IP : * Configuration Options : Phase generator and SIN COS LUT * System clock : 100 MHz * Mode of operation : Standard * Output frequency : 1.2 MHz * Output width : 8 Bits I want now to apply a low-pass filter and to see how is it going in simulation, using Analog waveform style. To generate the coefficients, I am using Matlab and the filterDesigner. Here are the specifications : * Lowpass, FIR (Equiripple) * Fs : 2.7 MHz * Fpass : 1.3 MHz * Fstop : 1.35 MHz * Apass : 1 dB * Astop :40 dB Then, I generate a .COE file which I use in the FIR compiler. I specify these options : * Filter type : Single rate * Input sampling frequency : 2.7 MHz * Clock frequency : 100 MHz * Coefficient type : signed, on 16 bits * Coefficient structure : Inferred * Input data type : Signed, on 8 bits * Output rounding mode : Full precision The screenshot shows what I obtain and it seems that it is not working very well. Does anybody can explain me what is going on ? Do I make some mistakes when I am setting up the filter ? Thank you very much for your help !