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| 型号： | MAX9930EVKIT+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL FOR MAX9930 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 类型： | 对数探测器/控制器 |
| 频率： | 2MHz ~ 1.6GHz |
| 适用于相关产品： | MAX9930 |
| 已供物品： | 板 |
2MHz to 1.6GHz 45dB RF-Detecting
Controllers and RF Detector
Filter Capacitor and Transient Response
In general, for the MAX9930/MAX9931/MAX9932, the
choice of filter capacitor only partially determines the
time-domain response of a PA control loop. However,
some simple conventions can be applied to affect tran-
sient response. A large filter capacitor, C CLPF , domi-
nates time-domain response, but the loop bandwidth
remains a factor of the PA gain-control range. The
bandwidth is maximized at power outputs near the cen-
ter of the PA’s range, and minimized at the low and
high power levels, where the slope of the gain-control
curve is lowest.
A smaller valued C CLPF results in an increased loop
bandwidth inversely proportional to the capacitor value.
Inherent phase lag in the PA’s control path, usually
caused by parasitics at OUT, ultimately results in the
addition of complex poles in the AC loop equation. To
avoid this secondary effect, experimentally determine
attenuation. A broadband resistive match is implement-
ed by connecting a resistor to ground at the external
AC-coupling capacitor at RFIN as shown in Figure 5. A
50 ? resistor (use other values for different input imped-
ances) in this configuration, in parallel with the input
impedance of the MAX9930–MAX9933, presents an
input impedance of approximately 50 ? . These devices
require an additional external coupling capacitor in
series with the RF input. As the operating frequency
increases over 2GHz, input impedance is reduced,
resulting in the need for a larger-valued shunt resistor.
Use a Smith Chart for calculating the ideal shunt resis-
tor value. Refer to the MAX4000/MAX4001/MAX4002
data sheet for narrowband reactive and series attenua-
tion input coupling.
the lowest usable C CLPF for the power amplifier of inter-
est. This requires full consideration to the intricacies of
the PA control function. The worst-case condition,
50 ? SOURCE
MAX9930
MAX9931
MAX9932
where the PA output is smallest (gain function is steep-
est) should be used because the PA control function is
50 ?
C C
RFIN
MAX9933
typically nonlinear. An additional zero can be added to
improve loop dynamics by placing a resistor in series
with C CLPF . See Figure 4 for the gain and phase
response for different C CLPF values.
R S
50 ?
C IN
V CC
R IN
Additional Input Coupling
There are three common methods for input coupling:
broadband resistive, narrowband reactive, and series
GAIN AND PHASE vs. FREQUENCY
Figure 5. Broadband Resistive Matching
SMALL-SIGNAL BANDWIDTH vs. C CLPF
80
MAX9930 fig04
180
10
60
40
GAIN
C CLPF = 2000pF
135
90
20
C CLPF = 200pF
C CLPF = 200pF
45
1
0
-20
0
-45
-40
-90
0.1
-60
-80
C CLPF = 2000pF
PHASE
-135
-180
-100
-225
0.01
10
100
1k
10k
100k
1M
10M 100M
100
1000
10,000
100,000
FREQUENCY (Hz)
Figure 4. Gain and Phase vs. Frequency
C CLPF (pF)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9930EVKIT+ | 功能描述:射频开发工具 MAX9930 Eval Kit RoHS:否 制造商:Taiyo Yuden 产品:Wireless Modules 类型:Wireless Audio 工具用于评估:WYSAAVDX7 频率: 工作电源电压:3.4 V to 5.5 V |
| MAX9931EUA+ | 功能描述:射频检测器 2MHz to 1.6GHz 45dB 射频检测器 RoHS:否 制造商:Skyworks Solutions, Inc. 配置: 频率范围:650 MHz to 3 GHz 最大二极管电容: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SC-88 封装:Reel |
| MAX9931EUA+T | 功能描述:射频检测器 2MHz to 1.6GHz 45dB 射频检测器 RoHS:否 制造商:Skyworks Solutions, Inc. 配置: 频率范围:650 MHz to 3 GHz 最大二极管电容: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SC-88 封装:Reel |
| MAX9932EUA+ | 功能描述:射频检测器 2MHz to 1.6GHz 45dB 射频检测器 RoHS:否 制造商:Skyworks Solutions, Inc. 配置: 频率范围:650 MHz to 3 GHz 最大二极管电容: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SC-88 封装:Reel |
| MAX9932EUA+T | 功能描述:射频检测器 2MHz to 1.6GHz 45dB 射频检测器 RoHS:否 制造商:Skyworks Solutions, Inc. 配置: 频率范围:650 MHz to 3 GHz 最大二极管电容: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SC-88 封装:Reel |
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