參數(shù)資料
型號(hào): NE5517A
廠商: ON SEMICONDUCTOR
元件分類: 跨導(dǎo)放大器
英文描述: Dual Operational Transconductance Amplifier(雙運(yùn)算跨導(dǎo)放大器)
中文描述: 雙路運(yùn)算跨導(dǎo)放大器(雙運(yùn)算跨導(dǎo)放大器)
文件頁(yè)數(shù): 9/14頁(yè)
文件大?。?/td> 186K
代理商: NE5517A
NE5517, NE5517A, AU5517
http://onsemi.com
9
Stereo Amplifier With Gain Control
Figure 24 shows a stereo amplifier with variable gain via
a control input. Excellent tracking of typical 0.3 dB is easy
to achieve. With the potentiometer, R
P
, the offset can be
adjusted. For AC-coupled amplifiers, the potentiometer
may be replaced with two 510 resistors.
Modulators
Because the transconductance of an OTA (Operational
Transconductance Amplifier) is directly proportional to I
ABC
,
the amplification of a signal can be controlled easily. The
output current is the product from transconductance
×
input
voltage. The circuit is effective up to approximately 200 kHz.
Modulation of 99% is easy to achieve.
4
3
+
NE5517/A
11
+V
CC
8
V
OUT1
V
CC
13
6
14
+
NE5517/A
9
V
C
R
S
V
OUT2
V
CC
INT
V
IN1
V
IN2
R
IN
R
IN
R
P
+V
CC
R
D
1
16
12
R
L
10k
+V
CC
INT
+V
CC
R
L
10k
10
I
ABC
I
ABC
15
R
P
+V
CC
R
D
1k
R
C
10k
1k
Figure 24. Gain-Controlled Stereo Amplifier
10k
30k
15k
15k
5.1k
V
CC
4
6
3
+
NE5517/A
8
R
S
V
OUT
V
CC
INT
V
IN1
CARRIER
1
11
+V
CC
R
L
10k
5
I
D
2
R
C
30k
V
IN2
SIGNAL
I
ABC
7
INT
+V
CC
V
OS
Figure 25. Amplitude Modulator
15k
1k
10k
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