3.5.7 UMTS Rx RF filter (FL103 : 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 Frequency Our Prellminary spec. Unit
D/N: T2140F3A
Min. Typ. Max.
Passband 2110...2170 MHz
Insertion Ioss 2110...2170MHz 1.5 2.0 dB
Ripple in passband 2110...2170MHz 0.5 1.2 dB
Amplitude imbalance 2110...2170MHz -1.5 -1.11 +1.5\ dB
+0.73
Phase imbalance 2110...2170MHz -10.0 -1.92 +10.0 deg.
+1.02
Attenuation Att1 0.1...1980MHz 40 43 dB
Att2 1980...2040MHz 30 34 dB
Att3 2250...3000MHz 18 25 dB
Att4 3000...6000MHz 25 40 dB
VSWR Input 2110...2170MHz 1.5 2.0
Output 2110...2170MHz 1.5 2.0
Input impedance (Single Ended) 50 Ohm
Output impedance (Differential) 100//10nH Ohm
Maximum drive level 1920...1980MHz +10 mW
DC Input level +3 V
Operating temperature -25 +85 deg. C
Storage temperature -30 +85 deg. C
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. TECHNICAL BRIEF
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[Table 3.3] UMTS Rx SAW Filter Specification
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