1.軟件版本

MATLAB2021a
2.本算法理論知識

??????? 這里，基于小數分頻的頻率合成器，考慮到你需要實現sigma-delta以及mash等結構。因此，系統的模塊結構如下圖所示：

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下面，我們對這個結構圖進行SIMULINK建模。

1.鑒相器采用XOR模塊設計。

?2.環路濾波器結構如下：

?這里通過一個低通濾波器進行設計。

3.壓控振蕩器的設計，

?上述幾個模塊都是可以通過現成的模塊進行搭建，

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3.核心代碼

clc; close all; warning off;window = hann(length(yout)); [Pyy,w] = periodogram(yout,window,100000); PSD2 = 1/M+1/100*(2*(w)).^4; Len = length(PSD2); %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% figure; semilogx(w/pi,10*log10(pi*Pyy),'b'); hold semilogx(w(Len/100:Len)/pi,10*log10(PSD2(Len/100:Len)),'k','linewidth',2); grid on xlabel('Normalized Frequency (x\pi rad/sample)') ylabel('Power/frequency(dB/rad/sample)'); %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% figure; plot(yout,'linewidth',2); grid on; xlabel('times'); ylabel('sigmadelta調制器輸出'); grid onfigure; hist(yout,5) xlabel('output yout') ylabel('number of occurance');figure; plot(yout2(1:3*Len/4),'linewidth',2); grid on; xlabel('times'); ylabel('V'); %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%分析頻率穩定度 Fre = yout3; K = 1; t1 = yout3(1:end-K); t2 = yout3(K+1:end);Err = abs(t1-t2)./t1;figure; loglog(Err,'linewidth',2); grid on; xlabel('times'); ylabel('頻率穩定度'); %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%最后進行雜散分析 N = 16; %累加器的位數； K = fix((2^N)*0.2); %頻率控制字，即累加的步長； D = 8; %8bit DAC g = gcd(K,2^N); pe = 2^N/(g); n = 1:pe; pp = pe+1; %頻譜分析點數 add_y = mod(n*K,2^N); %累加器的輸出表達式；%設定量化區間 pat = -1 + 1/ (2^ (D - 1) ):1/ (2^ (D - 1) ):1 - 1/ (2^ (D -1) ); %設定量化碼本值 codebook = -1 + 1/ (2^D):1/ (2^(D - 1) ) :1 - 1/ (2^D); rom_x = cos(2*pi*add_y/(2^N)); [index,quants2] = quantiz(rom_x,pat,codebook); [Pzz,wz] = periodogram(quants2,[],'onesided',pp);figure; psdplot(Pzz/max(Pzz),wz); %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

4.操作步驟與仿真結論

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?5.參考文獻

A37-01

6.完整源碼獲得方式

方式1：微信或者QQ聯系博主

方式2：訂閱MATLAB/FPGA教程，免費獲得教程案例以及任意2份完整源碼

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