340
Practical MATLAB
® Applications for Engineers
Nyquist diagram
Nyquist diagram
Nyquist plot without w
1.5
0.5
−0.5
−1
−1.5
−1
−0.5
0
0.5
1
0
1
Imaginary axis
Imaginary axis
Real axis
1.5
0.5
−0.5
−1
−1.5
−1
−0.5
0
0.5
1
0
1
Real axis
Nyquist plot with w
(w = −1:0 4:10)
FIGURE 4.6
Nyquist plots of R.4.69.
Bode plots with w (w = −1:0.4:10)
Bode diagram
10
−10
−20
−30
−45
−90
−135
−180
−225
10 −1
10 0
0
0
Frequency (rad/s)
Magnitude (dB)
Phase (degree)
Bode diagram
20
0
−20
−40
−60
−80
Magnitude (dB)
Bode plots without w
Phase (degree)
0
−45
−90
−135
−180
−225
10 −1
10 0
10 1
10 2
Frequency (rad/s)
FIGURE 4.7
Bode plots of R.4.69.
CRC_47760_CH004.indd 340
CRC_47760_CH004.indd 340
7/28/2008 12:25:56 PM
7/28/2008 12:25:56 PM