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參數(shù)資料
| 型號(hào)： | AD8349ARE-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類(lèi)： | 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(yè)數(shù)： | 21/28頁(yè) |
| 文件大小： | 969K |
| 代理商： | AD8349ARE-REEL7 |
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AD8349
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.
Rev. 0 | Page 21 of 28
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
modulated 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.
0
680nH
680nH
100pF
40.2
40.2
240
73
72
1
2
I
OUTB1
I
OUTA1
IBBN
IBBP
AD9777
AD8349
270pF
680nH
680nH
100pF
40.2
40.2
240
69
68
16
15
I
OUTB2
I
OUTA2
QBBN
QBBP
270pF
Figure 57. Single-Carrier WCDMA Application Circuit
(DAC-Modulator Interconnect)
–130
–120
–110
–100
–90
–80
–70
–60
–50
–40
–33
A
CENTER 2.14GHz
SPAN 24.6848MHz
0
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 ACPR and Alternate Channel Power Ratio
–72
–70
–68
–69
–71
–66
–67
–64
–65
–63
–62
–157
–151
–149
–150
–147
–148
–156
–154
–155
–152
–153
–26
–24
–22
–20
–18
–14
–16
–12
–10
–8
0
1960 ACPR
CHANNEL POWER (dBm)
A
3
2140 ACPR
1960 NOISE
2140 NOISE
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 –23 dBm, an ACPR of –60.7 dB is
achieved. Figure 61 shows the variation in ACP and noise floor
(dBc/Hz) with output power.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8349AREZ | 功能描述:IC QUADRATURE MOD 700MHZ 16TSSOP RoHS:是 類(lèi)別:RF/IF 和 RFID >> RF 調(diào)制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:調(diào)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(cè)試頻率:1.75GHz 封裝/外殼:28-WFQFN 裸露焊盤(pán) 包裝:帶卷 (TR) |
| AD8349AREZ-RL7 | 功能描述:IC MOD QUAD 2.7GHZ 16TSSOP RoHS:是 類(lèi)別:RF/IF 和 RFID >> RF 調(diào)制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:調(diào)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(cè)試頻率:1.75GHz 封裝/外殼:28-WFQFN 裸露焊盤(pán) 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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