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KG70C
6.1.2.2 LNA (U107)
The RFR6122 has cellular LNA. 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 specifications of KG70c LNA are described below
Parameter
Gain Mode 0(G0) Gain Mode 1(G1)
Gain
Noise Figure
Input IP3
6.1..2.3 Rx RF SAW FILTER (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.
6.1.2.4 Down-Converter Mixers (U107)
The RFR6122 device performs signal direct-down-conversion for Cellular applications. It contains all
the circuitry (with the exception of external filters) needed to support conversion of received RF
signals to baseband signals. The LO Buffer Amplifier buffers the RF VCO to the RF Transmit
Upconverter. RFR6122 offers the most advanced and integrated CDMA Rx solution designed to meet
cascaded Noise Figure (NF) and Third-order Intercept Point (IIP3) requirements of IS-98C and
J-STD-018 specifications for Sensitivity, Two-Tone Intermodulation, and Single-tone Desense.
Operation modes and band selection are specially controlled from the Mobile Station Modem MSM6100.
The specification of KG70c Mixers are described below:
Parameter
Noise Figure
Input IP3
Input IP2
6.1.3 Description of Transmit Part Circuit
16
4
1.5
5
10
7
High Gain Mode
10
4
56
Gain Mode 2(G2)
-5
5.5
15
Low Gain Mode
25
0
30
13
Gain Mode 3(G3)
Unit
-20
dB
20
dB
15
dBm
Unit
dB
dBm
dBm
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