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参数资料
| 型号： | TA2123AFG |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 0.006 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP48 |
| 封装： | 7 X 7 MM, 0.50 MM PITCH, PLASTIC, LQFP-48 |
| 文件页数： | 3/20页 |
| 文件大小： | 430K |
| 代理商： | TA2123AFG |
TA2123AFG
2004-12-01
11
The transfer function of bass boost is as follows from Fig.4.
G (ω) = G1 (ω)A1G2 (ω)G3 (ω)A2
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
G1 (ω) = 1 / (1 + jωC1R1)
fL = 1 / 2πC1R1
(2) Transfer function of BPF
G3 (ω) = jωC4R5 / [1 + jω (R4C3 + R5C3 + C4R4) ω2 R4C3R5C4]
C4
R5
C3
R4
2
/
1
O
f
π
=
(3) HPF gain and cut off frequency
G2 (ω) = 1 + R2 / (R3 + 1 / jωC2)
fHC = 1 / (2 π R3C2)
Fig.5
BPF
Graph.1 Characteristic of bass boost
(4) fO and fL
The fL and fO should be set up out of the audio frequency range. In case that the fO and fL is inside
of audio frequency range and AGC circuit operates, the voltage gain decrease.
(5) HPF
The fHC should be made 1 / 2 or less frequency as compared with the fL or fO. The phase difference
is large near the fHC, 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)
Resp
on
se
(
d
B)
30
3
20
10
0
10
20
10
100
300
Total characteristic
HPF
fL
fO
LPF
BPF
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