First Mixer - Nokia 9000i Service Manual

RAE/RAK–1N
RF
Parameter
Frequency band GSM
PCN
Supply voltage
Current consumption GSM
PCN
Insertion gain GSM
PCN
Gain flatness
Noise figure GSM
PCN
Reverse isolation
Gain reduction GSM
PCN
IIP3 GSM
PCN
Input VSWR (Zo=50 ohms)
Output VSWR (Zo=50 ohms)
RX Interstage Filter
The RX interstage filter is a three pole ceramic filter in PCN. In GSM there
is a SAW filter. The filter rejects spurious and blocking signals coming
from the antenna. It also rejects the local oscillator signal leakage.

First mixer

The first mixer is a single balanced passive diode mixer. The local signal
is balanced by a printed circuit transformer. The mixer down converts the
received RF signal to the first IF signal.
Parameter
RX frequency range GSM
PCN
LO frequency range GSM
PCN
IF frequency GSM
PCN
Conversion loss
Page 3– 14
Table 4. Pre amplifier specifications
Minimum Typical /
Nominal
935–960
1805 – 1880
4.27 4.5
5 6
4 5.5
15 16.5
8 10
+/– 0.5
2.0
2.3
15
33 36
21 24
–12 –10
–12 –10
Table 5. Mixer Specification
Minimum Typical /
Nominal
935
1805
1006
1492
71
313
5 6
After Sales
Technical Documentation
Maximum Unit / Notes
MHz
MHz
4.73 V
7 mA
8 mA
17 dB
12 dB
dB
2.5 dB
2.8 dB
dB
39 dB
27 dB
dBm
dBm
2.0
2.0
Maximum Unit / Notes
960 MHz
1880 MHz
1031 MHz
1567 MHz
MHz
MHz
7 dB
Amendment 1 04/97