MC1490 データシートの表示（PDF） - Motorola => Freescale
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MC1490 Datasheet PDF : 8 Pages
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MC1490
Figure 11. Noise Figure versus
Source Resistance
20
18
16
VCC = 12 Vdc
14
f = 105 MHz
12
10
f = 60 MHz
8.0
6.0
f = 30 MHz
4.0
2.0
0
100 200
400 600 1.0 k 2.0 k 4.0 k 10 k
RS, SOURCE RESISTANCE (Ω)
Figure 12. Noise Figure versus
AGC Gain Reduction
40
35 f = 30 MHz
BW = 1.0 MHz
30
25
20
15
Test circuit has tuned input
10
providing a source resistance
optimized for best noise figure.
5
0
0 –10 –20 –30 –40 –50 –60 –70 –80
GR, GAIN REDUCTION (dB)
Figure 13. Harmonic Distortion versus AGC Gain
Reduction for AM Carrier (For Test Circuit, See Figure 14)
40
f = 10.7 MHz
35 Modulation: 90 % AM, fm = 1.0 kHz
Load at Pin 8 = 2.0 kΩ
30 EO = peak–to–peak envelope of
modulated 10.7 MHz carrier at Pin 8
25
760 mVpp
20
EO = 2400 mVpp
15
240 mVpp
10
5.0
0
0 10 20 30 40 50 60 70 80
GR, GAIN REDUCTION (dB)
] ] Figure 14. 10.7 MHz Amplifier Gain 55 dB, BW 100 kHz
0.002
5.6 k
VAGC
10.7 MHz
(50 Ω Source) 82 pF
L1
50–150 pF
7
6
5
MC1490P
4
3
2
36 pF
8
50 Ω Load
1
L2
RFC
+12 Vdc
0.002 0.002
L1 = 24 turns, #22 AWG wire
on a T12–44 micro metal
Toroid core (–124 pF)
L2 = 20 turns, #22 AWG wire
on a T12–44 micro metal
Toroid core (–100 pF)
4
MOTOROLA ANALOG IC DEVICE DATA
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