參數(shù)資料
型號(hào)： MC1490
廠商： Motorola, Inc.
英文描述： WIDEBAND AMPLIFIER WITH AGC
中文描述： 寬帶放大器帶AGC
文件頁(yè)數(shù)： 4/8頁(yè)
文件大?。?/td> 364K
代理商： MC1490
MC1490
4
MOTOROLA ANALOG IC DEVICE DATA
Figure 11. Noise Figure versus
Source Resistance
Figure 12. Noise Figure versus
AGC Gain Reduction
Figure 13. Harmonic Distortion versus AGC Gain
Reduction for AM Carrier (For Test Circuit, See Figure 14)
40
f = 10.7 MHz
Modulation: 90 % AM, fm = 1.0 kHz
Load at Pin 8 = 2.0 k
EO = peak–to–peak envelope of
modulated 10.7 MHz carrier at Pin 8
Figure 14. 10.7 MHz Amplifier Gain
55 dB, BW
100 kHz
N
RS, SOURCE RESISTANCE (
)
0
2.0
4.0
6.0
8.0
10
12
14
16
18
20
100
200
400 600
1.0 k
2.0 k
4.0 k
10 k
f = 30 MHz
f = 60 MHz
f = 105 MHz
VCC = 12 Vdc
N
GR, GAIN REDUCTION (dB)
0
5
10
15
20
25
30
35
40
0
–10
–20
–30
–40
–50
–60
–70
–80
f = 30 MHz
BW = 1.0 MHz
Test circuit has tuned input
providing a source resistance
optimized for best noise figure.
H
M
GR, GAIN REDUCTION (dB)
0
5.0
10
15
20
25
30
35
0
10
20
30
40
50
60
70
80
760 mVpp
240 mVpp
EO = 2400 mVpp
Toroid core (–124 pF)
L1 = 24 turns, #22 AWG wire
on a T12–44 micro metal
L2 = 20 turns, #22 AWG wire
on a T12–44 micro metal
Toroid core (–100 pF)
0.002
0.002
0.002
L1
+12 Vdc
RFC
L2
36 pF
1
2
3
4
5
6
7
8
50
Load
82 pF
10.7 MHz
(50
Source)
VAGC
5.6 k
50–150 pF
MC1490P
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