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參數(shù)資料
| 型號： | ADL5390 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | RF/IF Vector Multiplier |
| 中文描述： | 射頻中頻向量乘法器/ |
| 文件頁數(shù)： | 17/24頁 |
| 文件大?。?/td> | 716K |
| 代理商： | ADL5390 |
ADL5390
QUADRATURE MODULATOR
The ADL5390 can be used as a quadrature modulator by driving
the RF I and Q inputs (INPI and INPQ) single-ended through a
90
o
phase splitter to serve as the LO input. I/Q modulation is
applied to the baseband I and Q gain control inputs (IBBP/IBBM
and QBBP/QBBM). A simplified schematic is shown in Figure
38.
Rev. 0 | Page 17 of 24
0
SPLITTER
SUM
TERM
PORT 1
PORT 2
QCN-12
Q
Q
I
I
RFOM
RFOP
INPI
Q DATA
I DATA
INPQ
1
5
3
ETC1-1-13
(M/A-COM)
4
ROFP
LO IN
ADL5390
10nF
10nF
10nF
10nF
66.5
66.5
50
Figure 38. Quadrature Modulator Application
Single sideband performance of a quadrature modulator is
determined by the magnitude and phase balance (compared to
a 90
o
offset) at the summation point of the I and Q signals.
Because the ADL5390 has matched amplifiers and mixers in
the I and Q channel, most of the single sideband performance
will be determined by the external 90
o
phase splitter. Good
single sideband performance can be achieved by choosing a
well-balanced 90
o
phase splitter. However, phase and magnitude
differences in the 90
o
phase splitter can be corrected by adjusting
the magnitude and phase of the I and Q data. Figure 39 shows
the performance of the ADL5390 used in conjunction with Mini-
Circuits QCN-12 90
o
power splitter. Figure 40 shows the single
sideband improvement as the I and Q data is adjusted in magnitude
and phase to achieve better single sideband performance.
For maximum dynamic range, the ADL5390 should be driven
as close to the output 1 dB compression point as possible. The
output power of the ADL5390 increases linearly with the RF
(LO) input power and baseband gain control input voltage until
the ADL5390 reaches compression. At the 1 dB compression
point, the lower sideband starts to increase. Figure 41 demon-
strates the output spectrum of a 3-carrier CDMA2000 signal
applied to the I/Q baseband gain control inputs. As the RF (LO)
power is increased, the relative amount of noise is reduced until
the ADL5390 goes into compression. At this point, the relative
noise increases, as shown in Figure 42.
Analog Devices has several quadrature/vector modulators that
have highly accurate integrated 90
o
phase splitters—AD8340,
AD8341, AD8345, AD8346, AD8349—that cover a variety of
frequency bands.
0
-90
-80
1
2
3
4
A
CENTER 900MHz
700kHz/
SPAN 7MHz
REF 7dBm
ATT 35dB
*
RBW 3kHz
1 AP
0
–70
–60
–50
–40
–30
–20
–10
DESIRED SIDEBAND
–16.20dBm
900.998397436MHz
UNDESIRED SIDEBAND
–23.27dB
–1.996794872MHz
THIRD BASEBAND HARMONIC
–37.38dB
–4.004807692MHz
LO FEEDTHROUGH
–41.27dB
–998.397435897kHz
Figure 39. SSB Quadrature Modulator Result Using External 90° Phase Splitter,
RF P
IN
= 15 dBm, VIBB = VQBB = 0.5 V
(With Reference to a Common-Mode Voltage of 0.5 V)
0
A
CENTER 900MHz
700kHz/
SPAN 7MHz
REF 7dBm
ATT 35dB
*
RBW 3kHz
1 AP
0
–70
–80
–90
–60
–50
–40
–30
–20
–10
1
2
3
4
DESIRED SIDEBAND
–16.78dBm
900.998397436MHz
UNDESIRED SIDEBAND
–51.81dB
–1.996794872MHz
THIRD BASEBAND HARMONIC
–38.45dB
–4.004807692MHz
LO FEEDTHROUGH
–41.49dB
–998.397435897kHz
Figure 40. SSB Modulator Applications with Gain and Phase Errors Corrected,
RF Pin = 15 dBm, VIBB = VQBB = 0.5 V (With Reference to a Common-Mode
Voltage of 0.5 V), I/Q Phase Offset by 3
o
, and Magnitude Offset by 0.5 V
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相關代理商/技術參數(shù) |
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|---|---|
| ADL5390ACPZ | 制造商:Analog Devices 功能描述:RF/IF VECTOR MLTPLR 24LFCSP - Tape and Reel 制造商:Analog Devices 功能描述:RF VECTOR MULTIPLIER 2.3GHZ SMD 制造商:Analog Devices 功能描述:RF Vector Multiplier,wideband,ADL5390 |
| ADL5390ACPZ-REEL7 | 功能描述:IC MULTIPLIER VECTOR 24LFCSP RoHS:是 類別:RF/IF 和 RFID >> RF 其它 IC 和模塊 系列:- 標準包裝:100 系列:* |
| ADL5390ACPZ-REEL71 | 制造商:AD 制造商全稱:Analog Devices 功能描述:RF/IF Vector Multiplier |
| ADL5390ACPZ-WP | 功能描述:IC MULTIPLIER RF VECTOR 24-LFCSP RoHS:是 類別:RF/IF 和 RFID >> RF 其它 IC 和模塊 系列:- 標準包裝:100 系列:* |
| ADL5390ACPZ-WP1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:RF/IF Vector Multiplier |
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