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參數(shù)資料
| 型號(hào)： | TA2123AF |
| 廠商： | Toshiba Corporation |
| 英文描述： | 1.5V Stereo Headphone Amplifier |
| 中文描述： | 1.5V的立體聲耳機(jī)放大器 |
| 文件頁(yè)數(shù)： | 11/20頁(yè) |
| 文件大小： | 427K |
| 代理商： | TA2123AF |
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TA2123AF
2002-10-30
11
The transfer function of bass boost is as follows from Fig.4.
G (
ω
) = G
1
(
ω
)
A
1
G
2
(
ω
)
G
3
(
ω
)
A
2
The bass boost effect is changed by external resistor or external capacitor. The transfer function and cut
off frequency are as follows.
(1) Transfer function of LPF
G
1
(
ω
) = 1 / (1 + j
ω
C1
R1)
f
L
= 1 / 2
π
C1
R1
(2) Transfer function of BPF
G
3
(
ω
) = j
ω
C4
R5 / [1 + j
ω
(R4
C3 + R5
C3 + C4
R4)
ω
2
R4
C3
R5
C4]
C4
R5
C3
R4
2
/
1
O
f
(3) HPF gain and cut off frequency
G
2
(
ω
) = 1 + R2 / (R3 + 1 / j
ω
C2)
f
HC
= 1 / (2 R3
C2)
Fig.5
BPF
Graph.1 Characteristic of bass boost
(4) f
O
and f
L
The f
L
and f
O
should be set up out of the audio frequency range. In case that the f
O
and f
L
is inside
of audio frequency range and AGC circuit operates, the voltage gain decrease.
(5) HPF
The f
HC
should be made 1 / 2 or less frequency as compared with the f
L
or f
O
. The phase difference
is large near the f
HC
, so that the bass boost level runs short. And the HPF gain of middle or high
frequency range should be set to 10dB or more.
A
Ra
Rb
Ca
Cb
Frequency f (Hz)
R
30
30
3
20
10
0
10
20
10
100
300
Total characteristic
HPF
fL
fO
LPF
BPF
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