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% Analog Signal Dt = 0.00005; t = -0.005:Dt:0.005; xa = exp(-1000*abs(t)); % % Continuous-time Fourier Transform Wmax = 2*pi*2000; K = 500; k = 0:1:K; W = k*Wmax/K; Xa = xa * exp(-j*t'*W) * D

,,,title "PWMOut - Output a PWM Analog Voltage" ,,,; ,,,; This Application simply Outputs an Analog Voltage by Driving a ,,,; Resistor/Capacitor ("RC") Network with a PWM signal. ,,,; ,,,; T

title "PWMOut - Output a PWM Analog Voltage" ; ; This Application simply Outputs an Analog Voltage by Driving a ; Resistor/Capacitor ("RC") Network with a PWM signal. ; ; The PWM runs at

# Generated by the VisualDSP++ IDDE (Thu Dec 18 10:00:30 2008) # Project File: E:\Work Space\Temp VDSP++\AD7877\Finished\AD7877.dpj "C:\Program Files\Analog Devices\VisualDSP 5.0\ccblkfn.exe" -c .

TMS320C24x Evaluation Board Jumper Settings for all programs in this directory. Jumper Jumper Name Position Description Analog supply JP1 1

/* * ADC.h */ // initialize the ADC for single conversion, select Analog input pins void initADC( int amask); int readADC( int ch);

/* * ADC.h */ // initialize the ADC for single conversion, select Analog input pins void initADC( int amask); int readADC( int ch);

/* * ADC.h */ // initialize the ADC for single conversion, select Analog input pins void initADC( int amask); int readADC( int ch);

%先对模拟滤波器进行预畸，可以消除偏差的影响 N=2;%number of poles T=0.2;%sampling time wc=2;%analog cutoff frequency Wc=wc*T/pi;%标准化后的数字滤波器的截止频率 [numd,dend]=butter(N,Wc);%直接用

%先对模拟滤波器进行预畸(prewarping)，可以消除偏差的影响 N=2;%number of poles T=0.2;%sampling time wc=2;%analog cutoff frequency Wc=wc*T/pi;%标准化后的数字滤波器的截止频率 [numd,dend]=butter(N,Wc);%直接用butter函数