Rf Module; Shielding; Environmental Specifications; Temperature Conditions - Nokia NSB-7 Series Service Manual

PAMS Technical Documentation

RF Module

This RF module takes care of all RF functions of GSM1900 single band engine. RF cir-
cuitry is on one side of a 8 layer transceiver PCB. PCB area for the RF circuitry is about 15
cm2. RF design is based on the first dualband direct conversion RF-IC "Hagar". So there is
no intermediate frequency. That means the number of components is lower than before
and there shall be much less interference problems than previously.

Shielding

EMC emissions are taken care by using metallized plastic shield which screens the whole
transceiver. Internal screening is realized by isolated partitions, these are the PA and the
VCO blocks. The baseband circuitry is located on the same side of pcb.
Minimum height on RF board is 1.8 mm and a little space has been reserved for higher
components (2.5 mm). In addition there is a possibility to put some higher (max. 2.0 mm)
components in low area (recesses can be made in plastic shield). Heat generated by the
circuitry will be conducted out via the PCB ground planes and metal shields.

Environmental Specifications

Normal and Extreme voltages
Lithium-Ion battery (1cell)
Nominal Voltage
Lower Extreme Voltage
Higher Extreme Voltage
Absolute Maximum Voltage
Software Cut-off Voltage

Temperature Conditions

RF Specifications are met within
-10...+55 deg C ambient temperature.
Storage temperature range is
-40...+70 deg C.

Humidity

Relative humidity range is 5... 95%.
This module is not protected against water. Condensation or splashed water
Issue 1 06/00
4.1 V
3.45 V (0.85 x 4.1 V = 3.49 V, "the MS shall inhibit
all RF transmissions when the power supply
voltage is below the manufacturer declared
shut-down voltage")
Nominal
5.1 V
3.1 V
ãNokia Mobile Phones Ltd.
NSB-7
System Module
Page 43