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Supply Ripple Rejection
5-7
Measured Results
5.6 Supply Ripple Rejection
The APA100 uses a closed loop which keeps the gain from changing with
supply voltage and improves the supply ripple rejection ratio (k
SRR
) over an
open−loop class-D amplifier. The supply ripple rejection ratio versus
frequency curve is shown in Figure 5−9.
Figure 5−9. APA100 Supply Ripple Rejection Ratio vs Frequency With 8-W Load
0
−10
−20
−30
−40
−50
−60
−70
−80
20 100 200 1 k 2 k 10 k 20 k
k
SR
− Supply Voltage Rejection Ratio − V
f − Frequency − Hz