CPOUT ADF4150HV PLL 37 6dB PAD 18 RFO" />
參數(shù)資料
型號: EVAL-ADF4150HVEB1Z
廠商: Analog Devices Inc
文件頁數(shù): 17/28頁
文件大?。?/td> 0K
描述: EVAL BOARD FOR ADF4150HV
標準包裝: 1
類型: 整數(shù) N 合成器(RF)
頻率: 3GHz
適用于相關(guān)產(chǎn)品: ADF4150HV
已供物品:
ADF4150HV
Rev. 0 | Page 24 of 28
RFOUT
VTUNE
150
18
MICROWAVE
VCO
CPOUT
ADF4150HV
PLL
37
6dB PAD
18
RFOUT
RFIN
GND
VDD2
VDD1
ADF5001
PRESCALER
0.1F
10pF
16GHz OUT
AC COUPLING INTEGRATED
ON ADF5001 DEVICE
09
05
8-
0
27
RFIN+
RFIN
18
Figure 29. 16 GHz Microwave PLL
GENERATING THE HIGH VOLTAGE SUPPLY
It is possible to use a boost converter such as the Analog Devices
ADP1613 to generate the high voltage charge pump supply
from a lower voltage rail without degrading PLL performance.
To minimize any switching noise feedthrough, ensure that
sufficient decoupling is placed close to the charge pump supply
pin (Pin 6). Care should be taken to use capacitors with the
appropriate voltage rating; for example, if using a boost converter
to generate a 20 V VP supply, use capacitors with a rating of
20 V or higher.
The design of the boost converter is simplified using the
ADP161x Excel-based design tool. This tool is available from the
ADP1613 product page. Figure 30 shows the user inputs for an
example 5 V input to 20 V output design. To minimize voltage
ripple at the output of the converter stage, the Noise Filter
option is selected, and the Vout Ripple field is set to its
minimum value. The high voltage charge pump current draw is
2 mA maximum; therefore, a value of 10 mA is entered in the
Iout
field to provide margin. When tested with the ADF4150HV
evaluation board, this design showed no evident switching
spurs at the VCO output.
09
05
8-
02
8
Figure 30. ADP161x Designer Tool
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