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HSMS-2827-TR1G 参数 Datasheet PDF下载

HSMS-2827-TR1G图片预览
型号: HSMS-2827-TR1G
PDF下载: 下载PDF文件 查看货源
内容描述: 表面贴装射频肖特基势垒二极管 [Surface Mount RF Schottky Barrier Diodes]
分类和应用: 二极管射频
文件页数/大小: 14 页 / 202 K
品牌: AGILENT [ AGILENT TECHNOLOGIES, LTD. ]
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7
assures that the characteristics of  
the two diodes are more highly  
matched than would be possible  
through individual testing and  
hand matching.  
bias  
detector diode  
PA  
V
bias  
differential  
amplifier  
bias  
HSMS-282K  
reference diode  
matching  
network  
HSMS-282P  
to differential amplifier  
differential  
amplifier  
Figure 15. High Power Differen-  
tial Detector.  
Figure 17. Voltage Doubler  
Differential Detector.  
The concept of the voltage  
matching  
network  
While the differential detector  
works well over temperature,  
another design approach works  
HSMS-2825  
doubler can be applied to the  
differential detector, permitting  
twice the output voltage for a  
given input power (as well as  
improving input impedance and  
suppressing second harmonics).  
[3]  
well for large signal detectors.  
See Figure 18 for the schematic  
and a physical layout of the  
circuit. In this design, the two  
4.7 Kresistors and diode D2 act  
as a variable power divider,  
assuring constant output voltage  
over temperature and improving  
output linearity.  
Figure 13. Differential Detector.  
However, care must be taken to  
assure that the two reference  
diodes closely match the two  
detector diodes. One possible  
configuration is given in Fig-  
ure 16, using two HSMS-2825.  
Board space can be saved  
through the use of the HSMS-282P  
open bridge quad, as shown in  
Figure 17.  
RF  
in  
V
o
D1  
4.7 KΩ  
4.7 KΩ  
68 Ω  
33 pF  
D2  
Figure 14. Fabrication of Agilent  
Diode Pairs.  
68 Ω  
33 pF  
bias  
RF  
in  
HSMS-2825  
or  
HSMS-282K  
In high power applications,  
coupling of RF energy from the  
detector diode to the reference  
diode can introduce error in the  
differential detector. The  
HSMS-282K  
V
o
4.7 KΩ  
differential  
amplifier  
Figure 18. Temperature Compen-  
sated Detector.  
HSMS-282K diode pair, in the six  
lead SOT-363 package, has a  
copper bar between the diodes  
that adds 10 dB of additional  
isolation between them. As this  
part is manufactured in the  
SOT-363 package it also provides  
the benefit of being 40% smaller  
than larger SOT-143 devices. The  
HSMS-282K is illustrated in  
Figure 15note that the ground  
connections must be made as  
close to the package as possible  
to minimize stray inductance to  
ground.  
HSMS-2825  
In certain applications, such as a  
dual-band cellphone handset  
operating at both 900 and  
1800 MHz, the second harmonics  
generated in the power control  
output detector when the handset  
is working at 900 MHz can cause  
problems. A filter at the output  
can reduce unwanted emissions  
at 1800 MHz in this case, but a  
matching  
network  
HSMS-2825  
Figure 16. Voltage Doubler  
Differential Detector.  
[3] Hans Eriksson and Raymond W. Waugh, A Temperature Compensated Linear Diode  
Detector,to be published.