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參數資料
| 型號： | DIV100 |
| 英文描述： | DIV100 - DISCONTINUED PRODUCT. No longer recommended for new design. |
| 中文描述： | DIV100 -已停產產品。不再推薦用于新設計。 |
| 文件頁數： | 11/11頁 |
| 文件大小： | 160K |
| 代理商： | DIV100 |
11
DIV100
The nonlinearity of the bridge has been eliminated and the
circuit output is independent of variations in the excitation
voltage.
AUTOMATIC GAIN CONTROL
A simple AGC circuit using the DIV100 is shown in Figure
15. The numerator voltage may vary both positive and
negative. The divider’s output is half-wave rectified and
filtered by D
, R
, and C
. It is then compared to the DC
reference voltage. If a difference exists, the integrator sends
a control signal to the denominator input to maintain a
constant output, thus compensating for input voltage changes.
VOLTAGE-CONTROLLED FILTER
Figure 16 shows how to use the DIV100 in the feedback
loop of an integrator to form a voltage-controlled filter. The
FIGURE 15. Automatic Gain Control Circuit.
transfer function is:
=
where: K = –R
2
/R
1
τ
=
This circuit may be used as a single-pole low-pass active
filter whose cutoff frequency is linearily proportional to the
circuit’s control voltage.
SQUARE ROOT
V
OUT
22
N
≥
+100mV
DIV100
N
13
9
2
12
1
47pF
V
OUT
= 10N
V
(S)
V
IN
(S)
τ
S + 1
K
V
CONTROL
10 R
2
C
FIGURE 17. Connection Diagram for Square Root Mode.
FIGURE 16. Voltage-Controlled Filter.
R
2
V
O
D
1
R
3
C
2
C
1
N
D
DIV100
10N/D
OPA627
R
1
Positive DC Reference Voltage
V
N
V
OUT
(s)
R
2
D
N
DIV100
10N/D
OPA627
V
CONTROL
C
R
1
V
CONTROL
≥
+250mV
V
IN
(s)
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