Only For Training And Service Purposes - LG KF700 Service Manual

3.5.7 UMTS Rx RF filter (FL102 : EFCH2140TDE1)
An RF filter is located between the UMTS LNA and mixer. Insertion loss is important, but not as critical
as losses before the LNA. The most important parameters of this component include:
■ Out-of-band rejection or attenuation levels, usually specified to meet these conditions:
■ Far out-of-band signals - ranging from DC up to the first band of particular concern and from the last
band of particular concern to beyond three times the highest passband frequency.
■ Tx-band leakage - the transmitter channel power, although attenuated by the duplexer, still presents
a cross-modulation threat in combination with Rx-band jammers. The RF filter must provide rejection
of this Tx-band leakage
■ Other frequencies of particular concern . bands known to include other wireless transmitters that
may deliver significant power levels to the receiver input.
Parameter
Passband
Insertion Ioss
Ripple in passband
Amplitude imbalance
Phase imbalance
Attenuation Att1
Att2
Att3
Att4
VSWR Input
Output
Input impedance (Single Ended)
Output impedance (Differential)
Maximum drive level
DC Input level
Operating temperature
Storage temperature
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Only for training and service purposes

Frequency
2110...2170MHz
2110...2170MHz
2110...2170MHz
2110...2170MHz
0.1...1980MHz
1980...2040MHz
2250...3000MHz
3000...6000MHz
2110...2170MHz
2110...2170MHz
1920...1980MHz
[Table 3.3] UMTS Rx SAW Filter Specification
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3. TECHNICAL BRIEF
Our Prellminary spec.
D/N: T2140F3A
Min. Typ. Max.
2110...2170
1.5 2.0
0.5 1.2
-1.5 -1.11 +1.5\
+0.73
-10.0 -1.92 +10.0
+1.02
40 43
30 34
18 25
25 40
1.5 2.0
1.5 2.0
50
100//10nH
+10
+3
-25 +85
-30 +85
Unit
MHz
dB
dB
dB
deg.
dB
dB
dB
dB
Ohm
Ohm
mW
V
deg. C
deg. C
LGE Internal Use Only