參數(shù)資料
型號(hào)： AD8349AREZ-REEL7
廠商： ANALOG DEVICES INC
元件分類： 調(diào)制器/解調(diào)器
英文描述： 700 MHz - 2700 MHz RF/MICROWAVE QPSK MODULATOR
封裝： LEAD FREE, MO-153ABT, TSSOP-16
文件頁(yè)數(shù)： 8/28頁(yè)
文件大小： 729K
代理商： AD8349AREZ-REEL7
AD8349
Rev. A | Page 16 of 28
03570-0-045
AD8349
PHASE
SPLITTER
Σ
LOIN
LOIP
VOUT
VPS1
VPS2
IBBP
IBBN
QBBP
QBBN
0.1
F
100pF
0.1
F
0.1
F
10
F
3
6
5
4
1
8
AD8132
2
IIN
499
499
0.1
F
+5V
499
24.8
49.9
499
10k
866
10
F
0.1
F
3
6
5
4
1
8
AD8132
2
QIN
499
499
0.1
F
+5V
499
24.9
49.9
499
+
COM1 COM2 COM3
10
F
0.1
F
+
–5V
10
F
0.1
F
+
–5V
Figure 44. Single-Ended IQ Drive Circuit
LO INPUT DRIVE LEVEL
The local oscillator inputs are designed to be driven differen-
tially. The device is specified with an LO drive level of –6 dBm.
This level was chosen to provide the best noise performance.
Increasing the LO drive level degrades sideband suppression
and increases carrier feedthrough, while improving noise
performance. Reducing the LO drive level creates the opposite
effect: improved sideband suppression and reduced carrier
feedthrough.
FREQUENCY RANGE
The LO frequency range is from 700 MHz to 2700 MHz. These
limits are defined by the nature of the LO phase splitter
circuitry. The phase splitter generates LO drive signals for the
internal mixers, which are 90 degrees out of phase from each
other. Outside of the specified frequency range (700 MHz to
2700 MHz), this quadrature accuracy degrades, resulting in
poor sideband rejection performance. Figure 45 and Figure 46
show the sideband suppression of a typical device operating
outside the specified LO frequency range. The level of sideband
suppression and degradation is also influenced by manufac-
turing process variations.
LO INPUT IMPEDANCE MATCHING
Single-ended LO sources are transformed into a differential
signal via a 1:1 balun (ETC1-1-13). A 200 shunt resistor to
GND on each LO input on the device side of the balun reduces
the return loss for the LO input port. Because the LO input pins
are internally dc-biased, ac coupling capacitors must be used on
each LO input pin.
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