LG VX8350 Service Manual page 30

VX8350
3.1.2.3 RFR6500 – LNA part (U106)
The RFR6500 has cellular, and PCS LNA, respectively. The characteristics of Low Noise Amplifier (LNA) are low
noise figure, high gain, high intercept point and high reverse isolation. The frequency selectivity characteristic of
mobile phone is mostly determined by LNA.
The specification of VX8350 LNA is described below:
Parameter
Gain
Noise Figure
Input IP3
3.1.2.4 GPS LNA(U108)
The characteristics of Low Noise Amplifier (LNA) are low noise figure, high gain, high intercept point and high
reverse isolation. The frequency selectivity characteristic of mobile phone is mostly determined by LNA.
The specification of VX8350 GPS LNA is described below
3.1.2.5 RX RF SAW FILTER(F100, F101)
The main function of RX RF SAW filter is to attenuate mobile phone spurious frequency, attenuate noise amplified
by the LNA and suppress second harmonic originating in the LNA.
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Low gain
Cellular PCS
-19 -20
20 20
10 10
Parameter
Gain
Noise Figure
1dB compression point
IIP3
Middle gain
Cellular PCS
3 -3
4.5 6
5 10
GPS Band
14.3
0.8
1.8
+4.7
29
High gain
Cellular PCS
14 15
1.3 1.1
7 3
Units
dB
dB
dBm
dBm
LGE Internal Use Only
Units
dB
dB
dBm