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ꢀ ꢁꢂ ꢃꢄꢄ ꢅꢆ ꢇ
SLOS407D − FEBRUARY 2003 − REVISED AUGUST 2004
SUPPLY RIPPLE REJECTION RATIO
TOTAL HARMONIC DISTORTION + NOISE
vs
vs
FREQUENCY
OUTPUT POWER
−40
−45
−50
10
R
C
= 8 Ω,
L
V
R
= 12 V
CC
= 4 Ω
= 1 µF,
2p5
L
Class-D
Gain = 13.2 dB
1
−55
−60
−65
−70
V
CC
= 8 V
f = 20 Hz
f = 1 kHz
0.1
V
CC
= 12 V
−75
−80
0.01
20 m
100 m
1
10
20
100
1 k
10 k 20 k
f − Frequency − Hz
P
O
− Output Power − W
Figure 17
Figure 18
INTERMODULATION PERFORMANCE
CLOSED LOOP RESPONSE
Gain
0
100
50
100
V
= 12 V, 19 kHz, 20 kHz,
CC
−20
1:1, P = 1 W, R = 8 Ω
O
L
50
Gain= +13.2 dB,
BW =20 Hz to 22 kHz,
Class-D
No Filter
−40
−60
0
0
Phase
−50
−100
−150
−200
−250
−50
−100
−150
−200
−250
−80
−100
−120
V
= 12 V,
CC
Gain= +36 dB,
= 8 Ω
R
L
Class-D
−140
50 100
1 k
10 k
10
100
1 k
10 k
100 k
1 M
f − Frequency − Hz
f − Frequency − Hz
Figure 19
Figure 20
15
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