ncofsymbol_tb.m

quartus2环境中设计的高速任意波形发生器

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% Altera NCO version 7.2
% file : ncofsymbol_tb.m
%
% Description : The following Matlab testbench excercises the NCO model ncofsymbol_model.m
% generated by Altera's NCO Megacore and outputs the sine and cosine waveforms
% to the variables sin_out and cos_out respectively
%
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% Parameter description
% N : the length of input and output arrays
% fs : the desired sampling rate. For Multi-channel NCO's the channelized sample rate is fs/M 
%      ehre M is the number of channels
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N=2048*1;
fs = 2.5E8;
% Input arrays

% phi_inc_i : input phase increment : Length N (required)
phi_inc_i = 171798692.*ones(1,N);
% freq_mod_i : frequency modulation input : Length N (optional)
freq_mod_i = zeros(1,N);
% phase_mod_i : phase modulation input : Length N (optional)
phase_mod_i = 4096.*ones(1,N);
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% function call to generated nco function
[sin_out,cos_out] = ncofsymbol_model(phi_inc_i,phase_mod_i,freq_mod_i);
fid_s = fopen('fsin_o_ncofsymbol_matlab.txt','w');
for i=1:N
  fprintf(fid_s,'%f\n',sin_out(i));
end
% Plot Channel 0 Time-Domain Output
xvalst = (0:1/fs:((N/1)-1)/fs);
figure,stairs(xvalst,sin_out(1:1:N),'r');
title ('Time-Domain Plot of NCO Channel 0 Output');
grid on;
zoom on;
xlabel ('Time');
ylabel ('Amplitude');

ncofftwinplot(sin_out(1:1:N),fs,0,'r');