參數(shù)資料
型號(hào)： RC4200N
廠商： FAIRCHILD SEMICONDUCTOR CORP
元件分類： 運(yùn)動(dòng)控制電子
英文描述： Analog Multiplier
中文描述： ANALOG MULTIPLIER OR DIVIDER, 4 MHz BAND WIDTH, PDIP8
封裝： PLASTIC, DIP-8
文件頁(yè)數(shù)： 16/23頁(yè)
文件大?。?/td> 206K
代理商： RC4200N
RC4200
PRODUCT SPECIFICATION
16
REV. 1.2.1 6/14/01
Amplitude Modulator with A.G.C.
In many AC modulator applications, unwanted output
modulation is caused by variations in carrier input ampli-
tude. The versatility of the RC4200 multiplier can be utilizes
to eliminate this undesired fluctuation. The extended range
multiplier circuit (Figure 4) shows an output amplitude
inversely proportional to the reference voltage V
REF
.
By making V
REF
proportional to V
Y
(where V
Y
is the car-
rier input) such that:
∫
Then the denominator becomes a variable value that auto-
matically provides constant gain, such that the modulating
input (V
X
) modulates the carrier (V
Y
) with a fixed scale
factor even though the carrier varies in amplitude.
i.e., V
0
V
V
Y
V
REF
---------------
R
R
d
R
1
R
2
-------------
=
V
REF
V
H
V
Y
(
)
=
=
If V
H
is made proportional to the average value of Asin
ω
t
(i.e., 2A/
π
) and scaled by a value of
π
/2 then:
V
H
=A
and if: V
X
= Modulating input (V
M
)
and: V
Y
Carrier input (Asin
ω
t)
Then: V
0
= K V
M
sin
ω
t where K =
The resistor scaling is determined by the dynamic range of
the carrier variation and modulating input.
The resistor values are solved, as with the other extended
range circuits, in terms of the input voltages.
Input voltages:
Modulation voltage (V
M
): 0
≤
V
M
≤
V
X
(max.)
Carrier (V
Y
): V
Y
= Asin
ω
t
Carrier amplitude fluctuation (
A):
A(min.) sint
≤
V
Y
≤
A(max.) sin
ω
t
Dynamic Range (N): A(max.)/A(min.),
A(max.) = V
H
(max.) and A(min.) = V
H
(min.)
R
R
d
R
1
R
2
-------------
Figure 15. RMS to DC Converter V
OUT
=
√
V
IN
2
65-1869
RC4200A
Multiplier
X
S
OUT
V
300K
100K
-V
3
6
4
5
8
7
1
2
100K
300K
REF
+V
200K
S
-V
S
+V
10K
30K
15K
100
0.1 F
*Determines sacle factor (K) for X function.
**Determines sacle factor (K) for X function.
+s
-Vs
1/2
RC5532
44.4K**
80K
60K
10K
RC4200A
Multiplier
X
S
100K
100K
-V
3
6
4
5
8
7
1
2
167K
60K
13.3K
S
-V
S
+V
10K
30K
45.5 K
100
0.1 F
1/2
RC5532
250K*
50K
50K
100K
V
IN
22 F
2
83.3K
100K
REF
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