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參數(shù)資料
| 型號(hào)： | BA3870 |
| 廠商： | Rohm CO.,LTD. |
| 英文描述： | TRANS PREBIASED NPN 200MW SOT323 |
| 中文描述： | 論壇（低音系統(tǒng)）無(wú)線電錄音機(jī) |
| 文件頁(yè)數(shù)： | 8/14頁(yè) |
| 文件大小： | 199K |
| 代理商： | BA3870 |
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1
2
π
(R
1
R
2
) C
1
(Hz)
(R
2
R
3
)
2
π
(R
1
R
2
R
2
R
3
R
1
R
3
) C
1
(Hz)
R
3
R
2
R
3
(dB)
: G
HP1
= 20log
R
3
R
1
//R
2
R
3
(dB)
: G
HP2
= 20log
R
10
R
11
R
10
(dB)
427
Audio ICs
BA3870
2. High-range signal system
The transmission of high frequency signals in Fig. 2
is as shown below.
The frequency characteristics of each block are shown
in Fig. 5, and the gain and cutoff frequency of each are
given by the following equations.
Cutoff frequency 1 of HPF: f
CH1
=
Cutoff frequency 2 of HPF: f
CH2
=
Attenuation of HPF in
frequency range f
f
CH1
Attenuation of HPF in
frequency range f
CH2
f
Gain of Amp D
: G
DH
= 20log
The total frequency characteristics show a +6dB/OCT
treble boost as shown in Fig. 6.
Also, R
11
= 2R
10
, thus
G
DH
= +9.5 (dB)
and the total gain G
H1
in the f
G
H1
= G
HP
1 + G
DH
G
H1
= G
HP1
+ 9.5 (dB)
f
CH1
frequency range is
The total gain G
H2
in the f
CH2
G
H2
= G
HP2
+ G
DH
G
H2
= G
HP2
+ 9.5 (dB)
f frequency range is
3. Combination of frequency characteristics
By combining the low-range characteristics (Fig. 4)
and the high-range characteristics (Fig. 6), ideal BBS
characteristics can be obtained as shown in Fig. 7.
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