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參數(shù)資料
| 型號： | MC13158FTB |
| 廠商： | MOTOROLA INC |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | WIDEBAND FM IF SUBSYSTEM FOR DECT AND DIGITAL APPLICATIONS |
| 中文描述： | TELECOM, CORDLESS, RF AND BASEBAND CIRCUIT, PQFP32 |
| 封裝： | PLASTIC, TQFP-32 |
| 文件頁數(shù)： | 19/24頁 |
| 文件大?。?/td> | 636K |
| 代理商： | MC13158FTB |
MC13158
19
MOTOROLA ANALOG IC DEVICE DATA
SYSTEM PERFORMANCE DATA
RSSI
In Figure 22, the RSSI versus RF Input Level shows the
linear response of RSSI over a 65 dB range but it has
extended capability over 80 dB from –80 dBm to +10 dBm.
The RSSI is measured in the application circuit (Figure 12) in
which a SAW filter is used before the mixer; thus, the overall
sensitivity is compromised for the sake of selectivity. The
curves are shown for three filters having different
bandwidths:
1) LCR Filter with 2.3 MHz 3.0 dB BW (Circuit and
Component Placement is shown in Figure 12)
2) Series–Parallel Ceramic Filter with 650 kHz 3.0 dB BW
(Murata Part # KMFC–545)
3) Ceramic Filter with 280 kHz 3.0 dB BW.
Figure 22. RSSI Output Voltage versus
Signal Input Level
– 90
3.0
R
SIGNAL INPUT LEVEL (dBm)
2.7
2.4
2.1
1.8
1.5
1.2
0.9
– 80
–70
– 60 – 50 – 40 – 30 – 20
20
–10
10
0
0.6
0.3
0
Series–Parallel
Ceramic Filter
Ceramic Filter
LCR; Rext = 150
VCC = 4.0 Vdc
fRF = 112 MHz
fLO = 122.7 MHz
fIF = 10.7 MHz
See Figure 12 for LCR filter
é
é
éé
0
éé
– 20
é
é
éé
– 40
éé
éé
éé
– 60
é
é
é
Figure 23. RSSI Output Rise and Fall Times
versus RF Input Signal Level
35
R
RF INPUT SIGNAL LEVEL (dBm)
30
25
20
15
10
5.0
0
r
f
μ
éé
tr
tf
tr
@
@
@
4
4
1
7
7
0
0
k
k
tr
tf
@
@
2
2
2
2
k
k
tf
@
1
0
0
k
k
SINAD Performance
Figure 24 shows a test setup for a narrowband
demodulator output response in which a C–message filter
and an active de–emphasis filter is used following the
demodulator. The input is matched using a 1:4 impedance
transformer. The SINAD performance is shown in Figure 25
with no preamp and in Figure 26 with a preamp (Preamp –
Figure 16). The 12 dB SINAD sensitivity is –101 dBm with no
preamp and –113 dBm with the preamp.
HP334
Distortion
Analyzer
N+D
HP8657B
fc = 112 MHz
fmod = 1.0 kHz
f =
±
125 kHz
C–Message
Filter
LO
Output
Input
Match
LO
In
HP8657B
fc = 122.7 MHz
PLO = –6.0 dBm
MC13158
IF 3.0 dB BW = 280 kHz
Active
De–emphasis
RF
Voltmeter
Detector Out
N
Figure 24. Test Setup for Narrowband SINAD
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