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參數資料
| 型號： | AD8349ARE-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 衰減器 |
| 英文描述： | 700 MHz to 2700 MHz Quadrature Modulator |
| 中文描述： | 700 MHz - 2700 MHz RF/MICROWAVE QPSK MODULATOR |
| 封裝： | MO-153ABT, TSSOP-16 |
| 文件頁數： | 16/28頁 |
| 文件大小： | 969K |
| 代理商： | AD8349ARE-REEL7 |
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AD8349
Rev. 0 | Page 16 of 28
0
AD8349
PHASE
SPLITTER
Σ
LOIN
LOIP
VOUT
VPS1
VPS2
IBBP
IBBN
QBBP
QBBN
0.1
μ
F
100pF
100pF
0.1
μ
F
0.1
μ
F
10
μ
F
3
6
5
4
1
8
AD8132
2
I
IN
499
499
0.1
μ
F
+5V
499
24.8
49.9
499
10k
866
10
μ
F
0.1
μ
F
3
6
5
4
1
8
AD8132
2
Q
IN
499
499
0.1
μ
F
+5V
499
24.9
49.9
499
+
+
COM1 COM2 COM3
10
μ
F
0.1
μ
F
+
–5V
10
μ
F
0.1
μ
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.
4.0
0
1.0
1.5
2.0
2.5
3.0
3.5
300
350
400
450
500
550
600
650
700
LO FREQUENCY (MHz)
S
–60
–50
–40
–30
–20
–10
0
S
SSB
USB
Figure 45. Sideband Suppression below 700 MHz
相關PDF資料 |
PDF描述 |
|---|---|
| AD8350 | Low Distortion 1.0 GHz Differential Amplifier |
| AD8350AR15 | Low Distortion 1.0 GHz Differential Amplifier |
| AD8350AR15-EVAL | Low Distortion 1.0 GHz Differential Amplifier |
| AD8350AR15-REEL | Low Distortion 1.0 GHz Differential Amplifier |
| AD8350AR15-REEL7 | Low Distortion 1.0 GHz Differential Amplifier |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD8349AREZ | 功能描述:IC QUADRATURE MOD 700MHZ 16TSSOP RoHS:是 類別:RF/IF 和 RFID >> RF 調制器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 功能:調制器 LO 頻率:700MHz ~ 2.3GHz RF 頻率:700MHz ~ 2.3GHz P1dB:1dBm 底噪:-148dBm/Hz 輸出功率:-1dBm 電流 - 電源:46mA 電源電壓:2.7 V ~ 3.6 V 測試頻率:1.75GHz 封裝/外殼:28-WFQFN 裸露焊盤 包裝:帶卷 (TR) |
| AD8349AREZ-RL7 | 功能描述:IC MOD QUAD 2.7GHZ 16TSSOP RoHS:是 類別:RF/IF 和 RFID >> RF 調制器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 功能:調制器 LO 頻率:700MHz ~ 2.3GHz RF 頻率:700MHz ~ 2.3GHz P1dB:1dBm 底噪:-148dBm/Hz 輸出功率:-1dBm 電流 - 電源:46mA 電源電壓:2.7 V ~ 3.6 V 測試頻率:1.75GHz 封裝/外殼:28-WFQFN 裸露焊盤 包裝:帶卷 (TR) |
| AD8349EVAL | 制造商:Analog Devices 功能描述:IC ((NS)) |
| AD8349-EVAL | 制造商:Analog Devices 功能描述:AD8349 EVALUATION BOARD - Bulk |
| AD8349-EVALZ | 制造商:Analog Devices 功能描述:AD8349 EVALUATION BOARD - Bulk |
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