Rf Asic Data; General Info; Erotus Asic; Rx Front Ends N701 And N721 - Nokia NSW-6 Series Disassembly & Troubleshooting Instructions

PAMS Technical Documentation

RF ASIC DATA

General Info

EROTUS (N700) provides three main RF functions:
1.
2.
3.
The receiver block consists of IF buffers, active mixers, 6–multiplier
(3*+2*), AGC amplifier and limiter.
The transmitter section includes a digital gain step amplifier, a linear gain
control amplifier, a divider, an I/Q Modulator and control part for the
Transmitter Power Control loop.
The PLL section is controlled via the serial bus and contains both 1GHz
UHF and VHF PLLs and prescalers.

EROTUS ASIC

Erotus is a uBGA–package, so RF probing for the most signals is impos-
sible at EROTUS pins. Signals can be checked at those components, to
which the signals are fed to.

RX Front ends N701 and N721

Pin no. Pin name
1 LO IN
2 Vdd buf
3 LO out
4 GND
5 Vdd LNA
6 GND
7 LNA in
8 GND
9 Gain Sel
10 LNA out
11 GND
12 Mxr RF
13 GND/½IF
14 MXR IF
15 GND
16 Vdd MXR
Issue 1 12/99
RX/TX IF blocks
PLLs for VHF and 1 GHz UHF
TX Power control circuits
Nominal
level
–5dBm
2.8V
0dBm
0
2.8V
0
–
0
>2V
–
0
–
0 Ground (½–IF tuing in N721)
–
0
2.8V Mixer LO–buffer Vdd and LO–buffer tuning
E Nokia Mobile Phones Ltd.
Disassembly & Troubleshooting
Description
Mixer LO input
LO–buffer Vdd
LO–buffer output
Ground
LNA Vdd
Ground
LNA RF input port
LNA ground
LNA gain select
LNA output port
Ground
Mixer RF input port
Mixer IF input port
Ground
NSW-6
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