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参数资料
| 型号： | EVAL-ADF4360-8EBZ1 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 16/24页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ADF4360-8 |
| 标准包装： | 1 |
| 主要目的： | 计时，频率合成器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | ADF4360-8 |
| 主要属性： | 带 VCO 的单路整数-N PLL |
| 次要属性： | 120MHz，1MHz PFD |
| 已供物品： | 板，线缆，软件 |
| 相关产品： | ADF4360-8BCPZ-ND - IC SYNTHESIZER VCO 24-LFCSP ADF4360-8BCPZRL7TR-ND - IC SYNTHESIZER VCO 24LFCSP ADF4360-8BCPZRL-ND - IC SYNTHESIZER VCO 24LFCSP |
| 其它名称： | Q4990657 |
ADF4360-8
Rev. A | Page 23 of 24
OUTPUT MATCHING
There are a number of ways to match the output of the
ADF4360-8 for optimum operation; the most basic is to use a
50 resistor to VVCO. A dc bypass capacitor of 100 pF is
connected in series, as shown in Figure 27. Because the resistor
is not frequency dependent, this provides a good broadband
match. The output power in the circuit below typically gives
9 dBm output power into a 50 load.
100pF
04763-030
RFOUT
VVCO
50
51
Figure 27. Simple ADF4360-8 Output Stage
A better solution is to use a shunt inductor (acting as an RF
choke) to VVCO. This gives a better match and, therefore, more
output power.
Experiments have shown that the circuit shown in Figure 28
provides an excellent match to 50 over the operating range of
the ADF4360-8. This gives approximately 0 dBm output power
across the specific frequency range of the ADF4360-8 using the
recommended shunt inductor, followed by a 100 pF dc blocking
capacitor.
L
100pF
04763-031
RFOUT
VVCO
50
Figure 28. Optimum ADF4360-8 Output Stage
The recommended value of this inductor changes with the VCO
center frequency. A graph of the optimum inductor value vs.
frequency is shown in Figure 29.
CENTRE FREQUENCY (MHz)
INDUCTANCE
(nH)
300
250
150
200
100
0
50
0
100
200
300
5000
400
04763-032
Figure 29. Optimum ADF4360-8 Shunt Inductor
Both complementary architectures can be examined using the
EVAL-ADF4360-8EB1 evaluation board. If the user does not
need the differential outputs available on the ADF4360-8, the
user should either terminate the unused output or combine
both outputs using a balun. Alternatively, instead of the LC
balun, both outputs may be combined using a 180° rat-race
coupler.
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