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參數(shù)資料
| 型號： | RM4200AD |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 模擬運算功能 |
| 英文描述： | ANALOG MULTIPLIER OR DIVIDER, 4 MHz BAND WIDTH, CDIP8 |
| 封裝： | CERAMIC, DIP-8 |
| 文件頁數(shù)： | 8/24頁 |
| 文件大?。?/td> | 188K |
| 代理商： | RM4200AD |
16
RC4200
PRODUCT SPECIFICATION
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 uctuation. The extended range
multiplier circuit (Figure 4) shows an output amplitude
inversely proportional to the reference voltage VREF.
By making VREF proportional to VY (where VY 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 (VX) modulates the carrier (VY) with a xed scale
factor even though the carrier varies in amplitude.
i.e., V
0
V
XVY
V
REF
----------------
R
0Rd
R
1R2
-------------
=
V
REF
V
H
V
Y
()
ò
==
If VH is made proportional to the average value of Asin
wt
(i.e., 2A/
p) and scaled by a value of p/2 then:
VH=A
and if: VX = Modulating input (VM)
and: VY Carrier input (Asin
wt)
Then: V0 = K VM sin
wt 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 (VM): 0
VM VX(max.)
Carrier (VY): VY = Asin
wt
Carrier amplitude uctuation (
DA):
A(min.) sint
VY A(max.) sinWwt
Dynamic Range (N): A(max.)/A(min.),
A(max.) = VH(max.) and A(min.) = VH(min.)
R
0Rd
R
1R2
-------------
Figure 15. RMS to DC Converter VOUT=
VIN2
65-1869
RC4200A
Multiplier
S
OUT
300K
100K
-V
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
m
*Determines sacle factor (K) for X function.
**Determines sacle factor (K) for X function.
+V = +V
= +15V
-V = -15V
1/2
RC5532
X
44.4K**
80K
60K
10K
RC4200A
Multiplier
S
100K
-V
36
4
5
8
7
1
2
167K
60K
13.3K
S
-V
S
+V
10K
30K
45.5 K
100
0.1 F
m
1/2
RC5532
X
250K*
50K
100K
V
IN
22 F
m
2
83.3K
100K
2
s
REF
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