User's Manual

VS500 USER MANUAL
Confidential & Proprietary of VACOM 10/13 Page Date : 05-08-08, Rev No : 1.0
Control No.: MSD351A0VS500
Originated by Hard Ware 3 Team
3.3.2.3 LNA part of RFR6122:(U511 - LNA part)
LNA transfers RF signal received through duplexer from base station as the most suitable signal. Because
the first amplifier after the antenna in a receiver block contributes most significantly to system noise
figure, LNA is used.
Division Specification Division Specification
Frequency range 869 ~894 MHz
CDMA Gain mode 0 CDMA Gain mode 2
Gain 16 dB (Typ.) Gain -5 dB (Typ.)
Noise figure 1.5 dB (Type.) Noise figure 5.5 dB (Type.)
IIP3 10 dBm IIP3 15 dBm
CDMA Gain mode 1 CDMA Gain mode
Gain 4 dB (Typ.) Gain -20 dB (Typ.)
Noise figure 5 dB (Type.) Noise figure 20 dB (Type.)
IIP3 7 dBm IIP3 15 dBm
3.3.2.4 RF SAW FILTER: (SW511)
It takes receive frequency (881.5
±
12.5MHz) only and the bandwidth is 25MHz. And it eliminates
signal except receive frequency like thermal noise contributed by TX signal. And it is consists of single
input and balanced output port.
Division Specification
Insertion loss 3.0 dB max
In-out VSWR 2.5 max
In band ripple 1.5 dB
Stop band attenuation (Tx band) 30 dB min
3.3.2.5 Quadrature I/Q Downconverter of RFR6122 : (U511 Mixer part)
Quadrature downconverter is to convert the RF signal (881.5 ±12.5MHz) amplified by LNA with the
baseband signal directly. Rx signal path include MSM-controlled gain adjustments. And driven Rx
signal passing AGC amplifier drive the RF port of the quadrature RF-to-baseband downconverter. The
downconverted baseband outputs are multiplexed and routed to low pass filter. The filter outputs are
buffered and passed on to the MSM processing.