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參數(shù)資料
| 型號(hào)： | SA575 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Low Voltage Compandor(低壓壓縮擴(kuò)展器) |
| 中文描述： | 低壓Compandor（低壓壓縮擴(kuò)展器） |
| 文件頁(yè)數(shù)： | 6/16頁(yè) |
| 文件大小： | 106K |
| 代理商： | SA575 |
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SA575
http://onsemi.com
6
Compressor
The typical compressor configuration is shown in
Figure 3. In this mode, the rectifier cell and variable gain
cell are in the feedback path. R
6
and R
7
provide the DC
feedback to the summing amplifier. The input is AC
coupled through C
12
and output is AC coupled through C
8
.
In a system with inputs and outputs AC coupled, C
8
and C
12
could be eliminated and only R
6
, R
7
, C
7
, and C
13
would be
required. If the external components R
6
, R
7
and C
7
are
eliminated, then the output of the summing amplifier will
motor-boat in absence of signals or at extremely low
signals. This is because there is no DC feedback path from
the output to input. In the presence of an AC signal this
phenomenon is not observed and the circuit will appear to
function properly.
The compressor gain expression and the attack and
release time constant is given by Equation 3 and
Equation 4, respectively.
(eq. 3)
4V
IN
(avg)
3.8 k x 100 A
where V
IN
(avg) = 0.95V
IN(RMS)
1/2
Compressor gain =
(eq. 4)
R
=
A
= 10 k x C
RECT
= 10 k x C
4
2.2 F
4.7 F
10 F
10 F
1 F
V
REF
G
C7
8
12
14
COMP IN
COMP OUT
11
16
15
13
Figure 3. Typical Compressor Configuration
10k
10k
3.8k
30k
30k
C
12
R
6
R
7
C
8
C
13
C
9
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