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参数资料
| 型号： | ADL5374ACPZ-WP |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 调制器/解调器 |
| 英文描述： | 3000 MHz - 4000 MHz RF/MICROWAVE QUADRAPHASE MODULATOR |
| 封装： | 4 X 4 MM, ROHS COMPLIANT, MO-220VGGD-2, LFCSP-24 |
| 文件页数： | 7/20页 |
| 文件大小： | 855K |
| 代理商： | ADL5374ACPZ-WP |
ADL5374
Rev. 0 | Page 15 of 20
An example is shown in Figure 32 with a third-order, Bessel
low-pass filter with a 3 dB frequency of 10 MHz. Matching input
and output impedances makes the filter design easier, so the
shunt resistor chosen is 100 Ω, producing an ac swing of
1 V p-p differential. The frequency response of this filter is
shown in Figure 33.
RBIP
50
RBIN
50
93
92
19
20
IBBN
IBBP
AD9779
F-MOD
RBQN
50
RBQP
50
84
83
23
24
RSLI
100
RSLQ
100
OUT1_N
OUT1_P
OUT2_P
OUT2_N
QBBP
QBBN
LPI
771.1nH
LNI
771.1nH
53.62nF
C1I
350.1pF
C2I
LNQ
771.1nH
LPQ
771.1nH
53.62nF
C1Q
350.1pF
C2Q
06
62
7-
03
2
Figure 32. DAC Modulator Interface with
10 MHz Third-Order, Bessel Filter
110
–60
–50
–40
–30
–20
–10
0
6
12
18
24
30
36
GR
OU
P
D
E
LA
Y
(
n
s)
06
62
7
-03
3
FREQUENCY (MHz)
MA
G
N
IT
U
D
E
(d
B
)
100
MAGNITUDE
GROUP DELAY
Figure 33. Frequency Response for DAC Modulator Interface with
10 MHz Third-Order Bessel Filter
USING THE AD9779 AUXILIARY DAC FOR CARRIER
FEEDTHROUGH NULLING
The AD9779 features an auxiliary DAC that can be used to
inject small currents into the differential outputs for each main
DAC channel. This feature can be used to produce the small
offset voltages necessary to null out the carrier feedthrough
from the modulator. Figure 34 shows the interface required to
use the auxiliary DACs, which adds four resistors to the interface.
RBIP
50
RBIN
50
93
90
92
19
20
IBBN
IBBP
AD9779
F-MOD
RBQN
50
RBQP
50
84
87
89
83
86
23
24
RSLI
100
RSLQ
100
OUT1_N
AUX1_N
AUX2_N
OUT1_P
AUX1_P
OUT2_P
AUX2_P
OUT2_N
QBBP
QBBN
LPI
771.1nH
LNI
771.1nH
53.62nF
C1I
350.1pF
C2I
LNQ
771.1nH
LPQ
771.1nH
53.62nF
C1Q
350.1pF
C2Q
250
500
250
06
62
7-
0
34
Figure 34. DAC Modulator Interface with Auxiliary DAC Resistors
WiMAX OPERATION
Figure 35 shows the adjacent and alternate channel power ratios
(10 MHz offset and 20 MHz offset), and the 30 MHz offset
noise floor vs. output power for a 10 MHz 1024-OFDMA
waveform at 3500 MHz.
–78
–76
–74
–72
–70
–68
–66
–64
–62
–158
–157
–156
–155
–154
–153
–152
–151
–150
30
M
H
zOFFS
E
T
N
O
IS
E
FL
OOR
(
d
B
m
/H
z)
30MHz OFFSET
NOISE FLOOR
066
27
-035
OUTPUT POWER (dBm)
ADJA
CE
N
T
AN
D
AL
T
E
RN
AT
E
C
HAN
NE
L
P
O
W
E
R
AT
IO
S
(
d
B)
–22
–20
–18
–16
–14
–12
–10
–8
–6
ALTERNATE CHANNEL
POWER RATIO
ADJACENT CHANNEL
POWER RATIO
Figure 35. Adjacent and Alternate Channel Power Ratios and
30 MHz Offset Noise Floor vs. Channel Power for a
10 MHz 1024-OFDMA Waveform at 3500 MHz; LO Power = 0 dBm
Figure 35 illustrates that optimal performance is achieved when
the output power from the modulator is 12 dBm or more. The
noise floor rises with increasing output power, but at less than half
the rate at which ACPR degrades. Therefore, operating at powers
greater than 12 dBm can improve the signal-to-noise ratio.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADL5375 | 制造商:AD 制造商全称:Analog Devices 功能描述:400 MHz to 6 GHz Broadband Quadrature Modulator |
| ADL5375_13 | 制造商:AD 制造商全称:Analog Devices 功能描述:400 MHz to 6 GHz Broadband Quadrature Modulator |
| ADL5375-05 | 制造商:AD 制造商全称:Analog Devices 功能描述:Interfacing the ADL5375 I/Q Modulator to the AD9779A Dual-Channel, 1 GSPS High Speed DAC |
| ADL5375-05ACPZ | 制造商:Analog Devices 功能描述:IC 400MHZ-6GHZ MOD QUAD 24LFCSP 制造商:Analog Devices 功能描述:IC, 400MHZ-6GHZ, MOD, QUAD, 24LFCSP 制造商:Analog Devices 功能描述:IC, 400MHZ-6GHZ, MOD, QUAD, 24LFCSP; Frequency Min:400MHz; Frequency Max:6GHz; RF Type:Quadrature; Supply Voltage Min:4.75V; Supply Voltage Max:5.25V; RF IC Case Style:LFCSP; No. of Pins:24; Operating Temperature Min:-40C; Operating;RoHS Compliant: Yes 制造商:Analog Devices 功能描述:Quadrature Mod 24-Pin LFCSP EP T/R |
| ADL5375-05ACPZ-R2 | 制造商:Analog Devices 功能描述:400 MHZ TO 6 GHZ BROADBAND QUADRATURE MODULATOR - Tape and Reel |
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