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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： | 16/20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 15 of 19
!
Typical Receiver Circuit Configuration
Three simple CMOS inverter type amplifiers are integrated in this RF-module IC in order to amplify the
FSK signals received from a remote
TIRIS
transponder up to a satisfactory logic level. The IC is
designed so as to permit their amplification factor and frequency characteristics to be selected within a
certain range by the use of appropriate external parts and/or circuits. A typical applied receiver circuit is
illustrated below.
In general, the FSK signals sent from a remote
TIRIS
transponder are found within a band of 120 kHz to
140 kHz, mainly due to dispersion of workmanship during manufacture and ambient temperature
fluctuation during transmitting operation. Therefore, by damping signals that fall out of the above band
range as much as possible, noise suppression performance can be improved. In the illustrated circuit
configuration, amplifier input coupling capacitors C2, C4 and C6 are used to reduce extremely
low-frequency noise signals, and amplifier output load capacitors C1, C3 and C5 to reduce
high-frequency noises. If you desire to enhance the noise resistance of the circuit still more, it is
necessary to install a required number of external wide band amplifiers with high amplification factor and
add an active band pass filter, LC resonance circuit, etc.
D1, D2 and R4 for input into the first amplifier (A1) form a circuit to prevent high-voltage signals for
power transmission and similar signals from entering the IC, thereby keeping from occurrence of
latch-up or other adverse situations. This circuit or otherwise, an equivalent protector, must be inserted
without fail.
1
2
3
4
5
6
To FSK signal demodulator
RI45538NS
R1
R2
R3
R4
C1
C2
C4
C5
A3OP
A3IN
A2OP
A2IN
A1OP
A1IN
From Antenna
C3
D2
D1
C6
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