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參數(shù)資料
| 型號： | TA2131FNG |
| 廠商： | Toshiba Corporation |
| 英文描述： | Low Current Consumption Headphone Amplifier for Portable MD Player (With Bass Boost Function) |
| 中文描述： | 低電流消耗為便攜式耳機(jī)放大器MD播放機(jī)（帶低音提升功能） |
| 文件頁數(shù)： | 7/19頁 |
| 文件大?。?/td> | 414K |
| 代理商： | TA2131FNG |
TA2131FNG
2006-04-19
7
2.
Low-Pass Compensation
2-1. Function
In C-couple type power amplifiers, it is necessary to give the output condenser C a large capacity to
flatten out the frequency characteristics to the low frequency band (this is because the loss in the low
frequency bandwidth becomes larger due to the effect of the high-pass filter comprising C and R
L
).
Particularly when the headphone load is approximately 16
and an attempt is being made to achieve
frequency characteristics of
±
3 dB at 20 Hz, a large capacity condenser of C
=
470
μ
F is required.
Bearing this situation in mind, a low-pass compensation function was built in to the TA2131FNG,
and while reducing the capacity of the output coupling condenser, almost flat (
±
3 dB) frequency
characteristics in all audible bandwidths (20 Hz to 20 kHz) have been achieved.
Fig.3 shows the low-pass system diagram, and Fig.4 shows the frequency characteristics at each point.
In Fig.4, (a) represents the status lost by the low-pass as a result of the high-pass filter comprising
the headphone load (R
L
=
16
) and the output coupling condenser (220
μ
F) in the C-coupling system.
V (OUT)
V (BST OUT)
V (LPF1)
V (NF1)
V (RL)
V (NF2)
V (LPF2)
1
10
100
1 k
10 k
100 k
60
40
20
0
20
40
f (Hz)
G
V
Figure 2 During Bass Boost (Frequency Characteristics to Each Terminal)
DAC
OUT
2
12
13
8
V
ref
ADD
V
ref
IN
A
BST
2
PW
A
PW
B
2
6
R
L
IN
B
OUT
B
BST
NF
2
OUT
A
2
1
1
10 k
10 k
15 k
10 k
15 k
10 k
10 k
20 k
16
220
μ
F
220
μ
F
V (OUT)
R
L
16
20 k
20 k
1
μ
F
10
μ
F
10
μ
F
V (R
L
)
Figure 3 Low-Pass Compensation System Diagram
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