This Spectrum Analyzer is implemented in the Virtex II Xilinx device available in the XtremeDSP kit. The analyzer is based on the Fast Fourier Transform computation. A 1024-point FFT is used. It can analyze signals up to 30 MHz (limited by the ADC sample frequency, 65 MHz) with a resolution of 10 kHz and its dynamic range is 74 dB. A spectral zoom by a factor of 2 or 4, together with four windows (rectangular, Hamming, Blackmann-Harris and Flattop) are selectable and the spectrum can be visualized in linear or logarithmic scale (dBs). The subsystem to computes the modulus and phase is preformed by a vectoring mode CORDIC with circular coordinates, and the subsystem to computes the &ldqou;log(x)” function is implemented with a vectoring mode CORDIC with hyperbolic coordinates.
FPGA resources
| FPGA resources | No. |
| Slices | 15543 |
| Multipliers (MULT18x18) | 940 |
| Block RAM (BRAM) | 37 |