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| 型号： | RI-RFM-006A-00 |
| 厂商： | Texas Instruments, Inc. |
| 英文描述： | TIRIS RF-Module IC for Automotive |
| 中文描述： | 提里斯射频集成电路模块汽车 |
| 文件页数： | 18/20页 |
| 文件大小： | 148K |
| 代理商： | RI-RFM-006A-00 |
Rev. 3.5
RI-RFM-006A
TIRIS
RF-Module IC for Automotive
Page 17 of 19
!
Precautions for Mounting and Actual Use
Described in this section are the precautions to be taken at mounting and actual use of the RI-RFM-006A
while designing and manufacturing a
TIRIS
Read-Write System using this IC, especially, critical issues
as may affect the operating performance of the IC and, in particular, the system communication
performance with a remote
TIRIS
transponder.
1. Power Supply Line
When the signals returned from a remote
TIRIS
transponder are amplified by sequentially using the three
CMOS inverter type amplifiers incorporated in this RF-module IC, an undesirable feedback loop is
formed from the third amplifier toward the first one through parasitic L, R and C whose formation is not
avoidable because of the structure of this IC and its internal power supply line (see the diagram below) as
CMOS devices are inevitably bi-directional. If this feedback loop is left as is, it normally leads to an
oscillation; particularly, when the frequency band of each amplifier is limited so that it matches that of
the transponder return signals, oscillation occurs at a frequency within this band which counts on high
gains from the very nature of things, in consequence, adversely affecting the demodulating performance
of the received FSK signals.
Equivalent circuit for internal power supply line feedback loop
This situation does not a little occur when a multiple number of high-gain amplifiers are integrated in a
CMOS device. Formation of this undesirable feedback loop in the amplifier band can be avoided by
minimizing the impedance of the power supply line through optimization of the printed circuit boards and
using a suitable bypass capacitor. It is extremely difficult to obtain true values for these parasitic L, R and
C forming the internal power supply line feedback loop, but it can be said from the empirical viewpoint
that it is possible to inhibit the said oscillation using a bypass capacitor with a capacity of
1
μ
F and having a sufficiently low impedance within the said amplifier frequency band provided that
appropriate wiring patterns are defined for the power supply line on the printed circuit boards and in the
peripheries of external parts for the amplifiers.
Positive power supply (Vcc) line
Feedback loop
Bypass capacitor
From Antenna
1
2
3
4
5
6
16
15
14
13
12
11
Amplifier 1
Amplifier 2
Amplifier 3
Internal power supply line
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| RI-RFM-006A-30 | 制造商:Rochester Electronics LLC 功能描述: |
| RI-RFM-007 | 制造商:TI 制造商全称:Texas Instruments 功能描述:HIGH PERFORMANCE LF RADIO FREQUENCY MODULE |
| RI-RFM-007B-00 | 功能描述:射频模块 LF Radio Frequency Module RoHS:否 制造商:Linx Technologies 产品:Transceiver Modules 频带:902 MHz to 928 MHz 输出功率:- 15.5 dBm to + 12.5 dBm 接口类型:UART 工作电源电压:- 0.3 VDC to + 5.5 VDC 传输供电电流:38.1 mA 接收供电电流:22.7 mA 天线连接器类型:U.FL 最大工作温度:+ 85 C 尺寸:1.15 mm x 0.63 mm x 0.131 mm |
| RI-RFM-007B-30 | 功能描述:射频模块 RFM Module High Perf RoHS:否 制造商:Linx Technologies 产品:Transceiver Modules 频带:902 MHz to 928 MHz 输出功率:- 15.5 dBm to + 12.5 dBm 接口类型:UART 工作电源电压:- 0.3 VDC to + 5.5 VDC 传输供电电流:38.1 mA 接收供电电流:22.7 mA 天线连接器类型:U.FL 最大工作温度:+ 85 C 尺寸:1.15 mm x 0.63 mm x 0.131 mm |
| RI-RFM-008B | 制造商:TI 制造商全称:Texas Instruments 功能描述:SERIES 2000 HIGH PERFORMANCE REMOTE ANTENNA RFM AND TUNING MODULE |
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