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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)： | 18/20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 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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