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參數(shù)資料
| 型號： | EVAL-ADF4360-3EB1 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | XO, clock |
| 英文描述： | Integrated Synthesizer and VCO |
| 中文描述： | 綜合合成器和VCO |
| 文件頁數(shù)： | 18/24頁 |
| 文件大?。?/td> | 559K |
| 代理商： | EVAL-ADF4360-3EB1 |
ADF4360-3
APPLICATIONS
DIRECT CONVERSION MODULATOR
Direct conversion architectures are increasingly being used to
implement base station transmitters. Figure 16 shows how ADI
parts can be used to implement such a system.
Rev. 0 | Page 18 of 24
The circuit block diagram shows the AD9761 TxDAC being
used with the AD8349. The use of dual integrated DACs, such
as the AD9761 with its specified ±0.02 dB and ±0.004 dB gain
and offset matching characteristics, ensures minimum error
contribution (over temperature) from this portion of the
signal chain.
The local oscillator is implemented using the ADF4360-3. The
low-pass filter was designed using ADIsimPLL for a channel
spacing of 100 kHz and an open-loop bandwidth of 10 kHz.
The frequency range of the ADF4360-3 (1.6 GHz to 1.95 GHz)
makes it ideally suited for implementation of a W-CDMA
transceiver.
The LO ports of the AD8349 can be driven differentially from
the complementary RF
OUT
A and RF
OUT
B outputs of the
ADF4360-3. This gives a better performance than a single-
ended LO driver and eliminates the often necessary use of a
balun to convert from a single-ended LO input to the more
desirable differential LO inputs for the AD8349. The typical
rms phase noise (100 Hz to 100 kHz) of the LO in this
configuration is 1.17°.
The AD8349 accepts LO drive levels from 10 dBm to 0 dBm.
The optimum LO power can be software programmed on the
ADF4360-3, which allows levels from 12 dBm to 3 dBm from
each output.
The RF output is designed to drive a 50 load but must be ac-
coupled, as shown in Figure 16. If the I and Q inputs are driven
in quadrature by 2 V p-p signals, the resulting output power
from the modulator will be approximately 2 dBm
AD9761
TxDAC
AD8349
REFIO
FSADJ
MODULATED
DIGITAL
DATA
QOUTB
IOUTA
IOUTB
QOUTA
2k
LOW-PASS
FILTER
LOW-PASS
FILTER
S
ADF4360-3
V
VCO
C
N
V
VCO
V
VCO
CPGND
1
AGND
9
DGNDRF
OUT
B
15
RF
OUT
A
CP
1nF
470pF
220pF
6.8nF
47nH
47nH
2.7pF
2.7pF
100pF
TO RF PA
4.3nH
4.3nH
1nF
1nF
4.7k
15k
6.8k
R
SET
C
C
LE
DATA
CLK
REF
IN
FREF
IN
V
TUNE
DV
DD
AV
DD
CE MUXOUT
VPS1
IBBP
IBBN
QBBP
QBBN
LOIP
LOIN
VPS2
5
4
24
7
20
23
2
21
6
14
16
17
18
19
13
3
8
10
11
22
12
V
DD
LOCK
DETECT
PHASE
SPLITTER
0
51
10
μ
F
Figure 16. Direct Conversion Modulator
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EVAL-ADF4360-4EB1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Integrated Synthesizer and VCO |
| EVAL-ADF4360-4EBZ1 | 制造商:Analog Devices 功能描述:Evaluation Board Integrated Synthesizer And VCO 制造商:Analog Devices 功能描述:Evaluation Board I.C. |
| EVAL-ADF4360-5EB1 | 制造商:Analog Devices 功能描述:EVALUATION BOARD FOR ADF4360-5 |
| EVAL-ADF4360-5EBZ1 | 制造商:Analog Devices 功能描述: |
| EVAL-ADF4360-6EB1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Integrated Synthesizer and VCO |
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