参数资料
型号: SM1212E433
厂商: Semtech
文件页数: 22/77页
文件大小: 0K
描述: RF EVAL FOR SX1212 433MHZ ISM
标准包装: 1
类型: 收发器,ISM
频率: 433MHz
适用于相关产品: SX1212E
已供物品: 模块,天线,电源,软件
SX1212
ADVANCED COMMUNICATIONS & SENSING
3.3.7.3. Suggested PA Biasing and Matching
The recommended PA bias and matching circuit is illustrated below:
VR_PA
47nF
100nH
PA
RFIO
SAW
DC block
Antenna
port
Low-pass and DC block
Figure 12: Recommended PA Biasing and Output Matching
Please refer to section 7.5.3 of this document for the optimized matching arrangement for each frequency band.
3.3.8. Common Input and Output Front-End
The receiver and the transmitter share the same RFIO pin (pin 31). Figure 13 below shows the configuration of the
common RF front-end.
In transmit mode, the PA and the PA regulator are active, with the voltage on the VR_PA pin equal to the
nominal voltage of the regulator (1.8 V). The external inductance is used to bias the PA.
In receive mode, both PA and PA regulator are off and VR_PA is tied to ground. The external inductance LT1
is then used to bias the LNA.
VR_PA
Reg_PA
Rx_on
To
RFIO
PA
LNA
Figure 13: Front-end Description
Rev 2 – June 18th, 2009
Page 22 of 77
www.semtech.com
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