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參數(shù)資料
| 型號(hào)： | AD8345ARE-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類(lèi)： | 衰減器 |
| 英文描述： | 250 MHz.1000 MHz Quadrature Modulator |
| 中文描述： | 140 MHz - 1000 MHz RF/MICROWAVE QUADRAPHASE MODULATOR |
| 封裝： | MO-153ABT, TSSOP-16 |
| 文件頁(yè)數(shù)： | 13/16頁(yè) |
| 文件大小： | 372K |
| 代理商： | AD8345ARE-REEL |
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REV. 0
AD8345
–13–
IEEE
HP34970A
D2
D1
D3
34901
34907
34907
D1
D2
D3
INTERFACE
BOARD
I_IN
Q_IN
OUTPUT_1
OUTPUT_2
ARB FUNCTION GEN
IEEE
TEKAFG2020
VPS1
VN
GND
VP
+15V MAX
COM
+25V MAX
–
25V MAX
HP3631
IEEE
AD8345
CHARACTERIZATION
BOARD
ENBL
P1
IN
IP
QP
QN
VOUT
P1
IN
IP
QP QN
RFOUT
IEEE
HP8648C
LO
IEEE
PC CONTROLLER
SPECTRUM
ANALYZER
RF I/P
SWEEP OUT
IEEE
28V
HP8593E
Figure 11. Characterization Board SSB Test Setup
CHARACTERIZATION SETUPS
SSB Setup
Essentially, two primary setups were used to characterize the
AD8345. These setups are shown in Figures 11 and 13. Figure
11 shows the setup used to evaluate the product as a Single
Sideband modulator. The interface board converts the single-
ended I and Q inputs from the arbitrary function generator to
differential inputs with a dc bias of approximately 0.7 V. The
interface board also provides connections for power supply
routing. The HP34970A and its associated plug-in 34901 were
used to monitor power supply currents and voltages being
supplied to the AD8345 characterization board. Two HP34907
plug-ins were used to provide additional miscellaneous dc and
control signals to the interface board. The LO input was driven
directly by an RF signal generator and the output was measured
directly with a spectrum analyzer. With the I Channel driven
with a sine wave and the Q Channel driven with a cosine wave,
the lower sideband is the single sideband output. The typical
SSB output spectrum is shown in Figure 12.
–
90
–
80
–
70
–
60
–
50
–
40
–
30
–
20
–
10
0
–
100
A
–
CENTER = 900MHz
SPAN = 1MHz
Figure 12. Typical SSB Output Spectrum
Modulated Waveform Setup
For evaluating the AD8345 with modulated waveforms, the
setup shown in Figure 13 was used. A Rohde & Schwarz
AMIQ signal generator with differential outputs was used to
generate the baseband signals. For all measurements the input
level on each baseband input pin was 0.7 V
±
0.3 V peak. The
output was measured with a Rohde & Schwarz FSIQ spec-
trum/vector analyzer.
+15V MAX
COM
+25V MAX
–
25V MAX
HP3631
IEEE
AD8345
CHARACTERIZATION
BOARD
ENBL
P1
IN
IP
QP
QN
VOUT
LO
RFOUT
IEEE
HP8648C
IEEE
PC CONTROLLER
SPECTRUM
ANALYZER
RF I/P
IEEE
FSIQ
PC CONTROL
AMIQ
IN
IP
QP
QN
Figure 13. Test Setup for Evaluating AD8345 with Modulated
Waveforms
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| AD8345ARE-REEL7 | 250 MHz.1000 MHz Quadrature Modulator |
| AD8345 | 250 MHz.1000 MHz Quadrature Modulator |
| AD8345-EVAL | 250 MHz.1000 MHz Quadrature Modulator |
| AD8345ARE | 250 MHz.1000 MHz Quadrature Modulator |
| AD8346ARU-REEL | 0.8 GHz-2.5 GHz Quadrature Modulator |
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