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ADL5375 Arkusz danych(PDF) 1 Page - Analog Devices

Numer części ADL5375
Szczegółowy opis  Providing Fixed Power Gain at the Output of an IQ Modulator
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ADL5375 Arkusz danych(HTML) 1 Page - Analog Devices

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Circuit Note
CN-0283
Circuits from the Lab™ reference circuits are engineered and
tested for quick and easysystemintegrationto helpsolve today’s
analog, mixed-signal, and RF design challenges. For more
informationand/orsupport,visitwww.analog.com/CN0283.
Devices Connected/Referenced
ADL5375
400 MHz to 6 GHz Broadband Quadrature
Modulator
ADL5320
400 MHz to 2700 MHz ¼ Watt RF Driver
Amplifier
Providing Fixed Power Gain at the Output of an IQ Modulator
Rev. 0
Circuitsfromthe Lab™circuitsfromAnalog Deviceshave been designedandbuiltbyAnalogDevices
engineers. Standard engineering practices have been employed in the design and construction of
eachcircuit,andtheirfunctionandperformancehavebeentestedandverifiedinalabenvironmentat
room temperature. However, you are solely responsible for testing the circuit and determining its
suitabilityandapplicabilityforyouruseandapplication.Accordingly,innoeventshallAnalogDevices
be liable for direct, indirect, special, incidental, consequential or punitive damages due to any cause
whatsoeverconnectedtotheuseofanyCircuitsfromtheLabcircuits. (Continuedonlastpage)
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2012 Analog Devices, Inc. All rights reserved.
EVALUATION AND DESIGN SUPPORT
Circuit Evaluation Boards
ADL5375 Evaluation Board (ADL5375-05-EVALZ)
Design and Integration Files
Schematics, Layout Files, Bill of Materials
CIRCUIT FUNCTION AND BENEFITS
Whether an IQ modulator is used in a direct conversion
application or as an upconverter to a first intermediate frequency
(IF), some gain is generally applied directly after the IQ modulator.
How to choose an appropriate driver amplifier to provide the
first stage of gain at the output of an IQ modulator will be
described. The devices shown in Figure 1 are the ADL5375
IQ modulator and the ADL5320 driver amplifier. They are well
matched from a system performance level; that is, they have
equivalent performance so neither device contributes to
degradation in the overall performance. Because these devices are
well matched in terms of their dynamic ranges, a simple direct
connection between the IQ modulator and the RF driver
amplifier is recommended without any need for attenuation
between the devices.
IBBP
IBBN
U1
AD L537 5
LOIP
LOIN
QBBN
QBBP
QUADRATURE
PHASE
SPLITTER
VPS1
NC
VPS2
+5V
COMM
C1
100pF
C5
0.1µF
C3
100pF
C2
100pF
C4
0.1µF
LO
1
2
(2)
3
U2
C9 10µF
C10 10nF
C11 22pF
L1
15nH
+5V
+5V
C12
22pF
C101 (C7)
1.5pF
C100 (C3)
0.5pF
λ1
λ3
λ4
λ2
C6
100pF
C7
100pF
R12
100Ω
QP
QN
R7
100Ω
IN
IP
RFOUT
DSOP
AMP_OUT
NOTE: SEE ADL5320 DATA SHEET FOR COMPONENT SPACING (λ) VALUES
2
5
8
11 12 17 19 20 14 23
6
7
13 15
1
16
18
24
21
3
4
9
10
22
ADL5320
Figure 1. Circuit Schematic for IQ Modulator with Output Power Gain


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