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Philips Semiconductors Application note
AN1651Using the NE/SA5234 amplifier
1991 Oct
4
D2
I
B2
I
B4
I
B5
I
B6
I
B8
I
B7
I
B9
I
B3
V
B4
V
CC
I
2
I
1
V
EE
D3
CLASS
AB
CONTROL
Q61 Q62
Q83
Q85
Q81
Q82
Q71
Q75
Q72
Q78
Q53,54
Q51,52
C1
C2
C3
C4
C5
R82
C6
Q84
OUTPUT
INPUT
+
–
INTERMEDIATE STAGE CURRENT CONTROL CLASS AB OUTPUT
R85 R76
R86 R75
SL00632
Figure 4.
dB
100
80
60
40
20
0
10Hz 100Hz 1kHz 10kHz 100kHz 1MHz
FREQUENCY
10 @ 10
6
G1000
SL00633
Figure 5. NE5234 Closed Loop Gain vs Frequency