1.2 Description of Receive Part Circuit
1.2.1 Quintplexer (U101)
The Quintplexer consists of the Rx bandpass filter (BPF), the Tx BPF and the GPS filter(BPF) which has
the function of separating Tx, Rx and GPS signals in the full Triplex system for using the common antenna. The
Tx part BPF is used to suppress noises and spurious out of the Tx frequency band. The Rx BPF is used to
receive only Rx signal coming from the antenna, which is usually called preselector. It’s main function is to
limit the bandwidth of spectrum reaching the LNA and mixer, attenuate receiver spurious response and suppress
local oscillator energy. As a result frequency sensitivity and selectivity of mobile phone increase. The
specification of VX5400 Quintplexer described below ;
z PCS band
Tx Rx Tx to Rx (min)
Pass Band
1850~1910 MHz 1930~1990 MHz
Insertion Loss
3.9 dB max 4.2 dB max
Return Loss
9.0 dB min 9.0dB min
Attenuation
43 dB min (1930~1990MHz) 52dB min
(1850~1910MHz)
54 dB (1850~1910MHz)
45 dB (1930~1990MHz)
z Cellular band
Tx Rx Tx to Rx (min)
Pass Band
824~849MHz 869~894 MHz
Insertion Loss
2.4 dB max 3.4 dB max
Return Loss
9.0 min 9.0 min
Attenuation
43 dB min (869~894MHz) 55 dB min (824~849MHz) 55 dB (824~849MHz)
45 dB (869~894MHz)
z GPS band
Pass Band
1574.42~1576.42MHz
Insertion Loss
1.5 dB max
Return Loss
10 min
Isolation1
34 dB min(Cell Tx Æ GPS)
Copyright@2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only
Only for training and serving purposes
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