Cirrus Logic AN257 - Manual (Page 4)

AN257
4 AN257REV1
Figure 4 shows the results from Figure 2 and Figure 3 as an overlay.
Color Sweep Trace Line Style Thick Data Axis Comment
3 1 Magenta Solid -1 Fft.Ch.1 Ampl Left Channel B = 60 Hz, 0 dBFS, PSR feedback enabled
-150
+0
-140
-130
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
d
B
r
A
20 20k 50 100 200 500 1k 2k 5k 10k
Hz
Figure 3. FFT Amplitude vs. Frequency,
Channel A = 1 kHz,
-
1 dBFS, Channel B = 60 Hz, 0 dBFS, PSR feedback enabled
Color Sweep Trace Line Style Thick Data Axis Comment
2 1 Blue Solid -1 Fft.Ch.1 Ampl Left Channel B = 60 Hz, 0 dBFS, PSR feedback disabled
3 1 Magenta Solid -1 Fft.Ch.1 Ampl Left Channel B = 60 Hz, 0 dBFS, PSR feedback enabled
-140
+0
-120
-100
-80
-60
-40
-20
d
B
r
A
20 20k 50 100 200 500 1k 2k 5k 10k
Hz
Figure 4. FFT Amplitude vs. Frequency,
Figure 2 & Figure 3 overlay