- 您现在的位置：买卖IC网 > PDF目录97841 > AD8349AREZ-RL7 (ANALOG DEVICES INC) 700 MHz - 2700 MHz RF/MICROWAVE QPSK MODULATOR PDF资料下载
参数资料
| 型号： | AD8349AREZ-RL7 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 调制器/解调器 |
| 英文描述： | 700 MHz - 2700 MHz RF/MICROWAVE QPSK MODULATOR |
| 封装： | MO-153ABT, TSSOP-16 |
| 文件页数： | 14/28页 |
| 文件大小： | 729K |
| 代理商： | AD8349AREZ-RL7 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页当前第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页
AD8349
Rev. A | Page 21 of 28
APPLICATIONS
3GPP WCDMA SINGLE-CARRIER APPLICATION
The interpolation filter used for the measurement of WCDMA
performance is shown in Figure 57. This third order Bessel filter
has a 3 dB bandwidth of 12 MHz. While the 3GPP single
channel bandwidth is only 3.84 MHz, this wide 3 dB bandwidth
of 12 MHz was driven by the need for a flat group delay out to
at least half the bandwidth of the baseband signal. Figure 58
shows a plot of a WCDMA spectrum at 2140 MHz using the
3 GPP Test Model 1 (64 channels active). At an output power of
–17.3 dBm, an adjacent channel power ratio (ACPR) just shy of
–69 dBc was measured.
Figure 59 shows the variation in ACPR with output power at
1960 MHz and 2140 MHz. It also shows the noise floor
measured at an offset of 30 MHz from the center of the modu-
lated WCDMA signal. From the graphs, it can be seen that there
is an optimal output power at which to operate that delivers the
best ACPR. If the output power is increased beyond that point,
the ACPR degrades as the result of increased distortion. Below
that optimum, the ACPR degrades due to a reduction in the
signal-to-noise ratio of the signal.
03570-0-058
680nH
100pF
40.2
40.2
240
73
72
1
2
IOUTB1
IOUTA1
IBBN
IBBP
AD9777
AD8349
270pF
680nH
100pF
40.2
40.2
240
69
68
16
15
IOUTB2
IOUTA2
QBBN
QBBP
270pF
Figure 57. Single-Carrier WCDMA Application Circuit
(DAC-Modulator Interconnect)
–130
–120
–110
–100
–90
–80
–70
–60
–50
–40
–33
AMP
L
ITUDE
(dBm)
CENTER 2.14GHz
SPAN 24.6848MHz
03570-0-059
CH PWR = –17.3dBm
ADJ CPR = –68.7dB
ALT CPR = –72.7dB
ALT
LO
ADJ
LO
CH
ADJ
UP
ALT
UP
Figure 58. Single-Carrier WCDMA Spectral Plot at 2140 MHz,
including Adjacent and Alternate Channel Power Ratio
–72
–71
–70
–69
–68
–67
–66
–65
–64
–63
–62
–26
–24
–22
–20
–18
–16
–14
–12
–10
–8
CHANNEL POWER (DBM)
ACP
R
(dB)
–157
–156
–155
–154
–153
–152
–151
–150
–149
–148
–147
NOIS
E
FLOOR
(dBm/Hz)
2140 ADJ CPR
2140 NOISE
1960 NOISE
1960 ADJ CPR
03570-0-060
Figure 59. Single-Carrier WCDMA ACPR and Noise Floor (dBm/Hz) at 30 MHz
Carrier Offset vs. Channel Power at 1960 MHz and 2140 MHz
(Test Model 1 with 64 Active Channels)
WCDMA MULTICARRIER APPLICATION
The high dynamic range of the AD8349 also permits use in
multicarrier WCDMA applications. Figure 60 shows a 4-carrier
WCDMA spectrum at 1960 MHz. At a per-carrier power of
–24.2 dBm, an ACPR of –60.4dB is achieved. Figure 61 shows
the variation in ACP and noise floor (dBc/Hz) with output
power.
–130
–120
–110
–100
–90
–80
–70
–60
–50
–40
–30
AMP
L
ITUDE
(dBm)
CENTER 1.96GHz
SPAN 40MHz
4MHz/
03570-0-062
CH PWR = –24.2dBm
ADJ CPR = –60.4dB
ALT CPR = –63.1dB
Figure 60. 4-Carrier WCDMA Spectral Plot at 1960 MHz,
Including Adjacent and Alternate Channel Power Ratio
相关PDF资料 |
PDF描述 |
|---|---|
| AD8349AREZ-REEL7 | 700 MHz - 2700 MHz RF/MICROWAVE QPSK MODULATOR |
| AD8350ARMZ20 | 1000 MHz RF/MICROWAVE WIDE BAND MEDIUM POWER AMPLIFIER |
| AD8350ARZ20 | 1000 MHz RF/MICROWAVE WIDE BAND MEDIUM POWER AMPLIFIER |
| AD8350ARZ15-REEL7 | 1000 MHz RF/MICROWAVE WIDE BAND MEDIUM POWER AMPLIFIER |
| AD8350ARMZ15-REEL7 | 1000 MHz RF/MICROWAVE WIDE BAND MEDIUM POWER AMPLIFIER |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| AD8349XRE | 制造商:Analog Devices 功能描述:800 MHZ - 2.7 GHZ QUADRATURE MODULATOR - Rail/Tube |
| AD8349XRE-REEL7 | 制造商:Analog Devices 功能描述:800MHZ-2.7GHZ QUADRATURE MODULATOR - Tape and Reel |
发布紧急采购，3分钟左右您将得到回复。