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參數(shù)資料
| 型號(hào)： | KA2221 |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | Dual Low Noise Equalizer Amplifier(低噪聲雙均衡放大器) |
| 中文描述： | 雙低噪聲放大器，均衡器（低噪聲雙均衡放大器） |
| 文件頁(yè)數(shù)： | 4/6頁(yè) |
| 文件大?。?/td> | 119K |
| 代理商： | KA2221 |
KA2221 DUAL LOW NOISE EQ AMP
APPLICATION INFORMATION
External Components (Refer to test circuits)
C
1
(C
10
):
Noise filter
These capacitors prevent radio interference in strong electric fields. The recommended value is 1000pF.
C
2
(C
8
):
Input coupling capacitor
The recommended value is 10
￥ì
F. If made too small, the low frequency characteristics will change for the worse,
but too large a value will increase the rising time when power is applied.
C
1
(C
9
):
Negative feedback capacitor
The lower cut-off frequency depends on the value of these capacitors and is determined as follows:
1
C
3
(C
8
) =
f
: Low cut-off frequency
If the value of these capacitors is made larger, the starting time of amplifier is delayed further.
C
5
(C
6
):
Output coupling capacitor
The recommended value is 10
￥ì
F.
R
2
, R
3
, C
7
(R
, R
, C
): Equalizer network
The time constants of standard NAB characteristic are as follow.
R
1
(R
6
):
Feedback component
The closed loop gain is determined approximately by the following relationship.
Gvc = 20 log Z + R
Z = R
2
+ R
3
//C
7
ú
Choose R
2
, R
3
, (DC resistance of NAB element) as
100K
approximately.
Tape speed
C
7
(R
2
+ R
3
)
R
2
, C
7
9.5cm/sec
3180
μ
sec
90
μ
sec
4.75cm/sec
1590
μ
sec
120
μ
sec
2
π
f
L
R1 (R
6
)
1
R
1
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