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參數(shù)資料
| 型號： | LTM9005CV-AA#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PBGA204 |
| 封裝： | 22 X 15 MM, 4.32 MM HEIGHT, LEAD FREE, MO-222, LGA-204 |
| 文件頁數(shù)： | 7/24頁 |
| 文件大小： | 468K |
| 代理商： | LTM9005CV-AA#PBF |
LTM9005
15
9005p
applicaTions inForMaTion
RF input impedance and S11 versus frequency (with no
external matching) are listed in Table 1 and referenced
to Pin M3. The S11 data can be used with a microwave
circuitsimulatortodesigncustommatchingnetworksand
simulate board-level interfacing to the RF input filter.
Table 1 RF Input Impedance vs Frequency
FREQUENCY
(MHz)
INPUT
IMPEDANCE
S11
MAG
ANGLE
50
4.6 + j2.3
0.832
174.7
300
9.1 + j11.2
0.706
153.8
450
12.0 + j14.5
0.639
145.8
600
14.7 + j17.4
0.588
138.7
900
20.5 + j23.3
0.506
123.4
1300
34.4 + j30.3
0.380
97.5
1700
59.6 + j23.8
0.299
55.8
1950
69.2 + j2.8
0.163
6.9
2200
59.2 – j18.1
0.184
–53.5
2450
41.5 – j24.5
0.274
–94.2
2700
28.3 – j21.3
0.374
–120.3
3000
19.0 – j13.5
0.481
–145.5
3300
13.9 – j5.1
0.568
–167.3
3600
10.8 + j3.4
0.645
171.9
3900
9.4 + j12.3
0.700
151.4
RF Input Overload
In the event of an overload condition at the RF in-
put, (Applications to provide additional text following
characterization).
LO Input Port
TheLOinput,showninFigure6,isinternallymatchedfrom
1GHz to 5GHz. The input match can be shifted down, as
low as 750MHz, with a single shunt capacitor (C4) on Pin
M6. One example is plotted in Figure 7 where C4 = 2.7pF
produces a 50MHz to 1GHz match.
Figure 6. LO Input Schematic
Figure 7. LO Input Return Loss
LO input matching below 750MHz requires the series
inductor (L4)/shunt capacitor (C4) network shown in
Figure 6. Two examples are plotted in Figure 7 where
L4 = 2.7nH/C4 = 3.9pF produces a 650MHz to 830MHz
match and L4 = 10nH/C4 = 8.2pF produces a 460MHz to
560MHz match.
The optimum LO drive is –3dBm for LO frequencies above
1.2GHz, although the amplifiers are designed to accom-
modate several dB of LO input power variation without
significant mixer performance variation. Below 1.2GHz,
0dBm LO drive is recommended for optimum noise figure,
although –3dBm will still deliver good conversion gain
and linearity.
LOIN
C4
L4
LO
VCC1
LIMITER
VREF
9005 F06
EXTERNAL
MATCHING
FOR LO < 1GHz
TO
MIXER
15
REGULATOR
LO FREQUENCY (GHz)
0.3
L4 = 10nH
C4 = 8.2pF
L4 = 2.7nH
C4 = 3.9pF
L4 = 0
C4 = 2.7pF
–30
LO
POR
TRETURN
LOSS
(dB)
–10
0
1
5
9005 F07
–20
NO EXT
MATCH
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