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參數(shù)資料
| 型號： | RI-RFM-006A-00 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | TIRIS RF-Module IC for Automotive |
| 中文描述： | 提里斯射頻集成電路模塊汽車 |
| 文件頁數(shù)： | 19/20頁 |
| 文件大?。?/td> | 148K |
| 代理商： | RI-RFM-006A-00 |
Rev. 3.5
RI-RFM-006A
TIRIS
RF-Module IC for Automotive
Page 18 of 19
Wiring for Antenna Circuit
As previously described, the FSK signals sent from a remote
TIRIS
transponder are normally found
within a band of 120 kHz to 140 kHz. Therefore, the signal receiving circuit of this
TIRIS
Transmitter-
Receiver System is designed so that the signal amplification factor is necessarily highest within this band.
Because of this, all signals and noises which are produced by other devices and whose frequencies fall
within this band greatly affect the system performance, especially, its available data communication
distance with the remote
TIRIS
transponder among others.
In the same way, they have quite the undesirable effect not only upon the environment in which the
proper antenna for the system is found, but also upon the wire used to connect it with the IC’s “A1IN” pin
which works as the first-phase amplifier for received signals. Furthermore, if there are wires for square or
pulse wave logic signals containing high-frequency components (even though their fundamental
frequencies are low) very close to this antenna connection wire, the system’s available data
communication distance with the remote
TIRIS
transponder is further shortened due to the adverse
effects of such wires. For all that, if there is no other alternative than to use a long wiring between the IC
and its external antenna, it is suggested that a shielded wire be used for antenna wiring in either way as
illustrated below. With this, the antenna wiring will be less susceptible to the aforementioned adverse
effects.
a. When the antenna is driven first.
b. When the capacitor is driven first.
RI45538NS
7
8
TXLO
TXHI
To receiver amplifier
Shielded wire
Antenna
Antenna resonance capacitor
RI45538NS
7
8
TXLO
TXHI
To receiver amplifier
Shielded wire
Antenna
Antenna resonance capacitor
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