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| 型号： | TA2131FNG |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 0.008 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
| 封装： | 0.300 INCH, 0.65 MM PITCH, PLASTIC, SSOP-24 |
| 文件页数： | 18/19页 |
| 文件大小： | 411K |
| 代理商： | TA2131FNG |
TA2131FNG
2006-04-19
8
<Principle of Low-Pass Compensation>
The low-pass component alone is extracted from the composite signal of PWA/PWB output, and that
frequency signal is fed back to PWA/PWB once more via the inversion amplifier, thereby making it
possible to increase the gain only of the low-pass component. The frequency characteristics of the
power amplifier output V (OUT) in this state are shown in Fig.4 (b). In practice they are the
frequency characteristics (c) viewed from load terminal V (RL), and the low-pass is compensated
relative to the state in (a).
2-2.
Low-Pass Compensation Condenser and Crosstalk
In this low-pass compensation condenser circuit, processing is carried out using the composite
signal of power amplifier output, so this affects crosstalk, according to the amount of compensation.
f characteristics and crosstalk generated by the capacity of the condenser for compensation (2-pin) are
shown below.
f
(Hz)
G
V
(
d
B
)
(b)
(c)
(a)
1
10
100
1 k
10 k
100 k
0
10
20
10
Figure 4
Power Amplifier Frequency Characteristics
VCC1 = 2.8 V
VCC2 = 1.2 V
Rg = 620
RL = 16
Filter: LPF 80 kHz
Output C
= 220 F
10
0
10
30
100
300
1 k
3 k
10 k
30 k
C
= 0.47 F
C
= 2.2 F
C
= 1 F
Vref short
f
(Hz)
R
e
s
pon
s
e
(dB)
Figure 5
Condenser and f Characteristics for Low-Pass Compensation
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