Nokia 2220 Service Manual
CCS Technical Documentation
System Module
RH-42
Issue 2 09/2003
Nokia Corporation Confidential
Page 41
parts, highband TX upconverter, lowband TX upconverter, and all PLLs, lowband LNA, TX
VHF VCO active part, and loopfilter.
VHF VCO active part, and loopfilter.
RF filtering, 2G LNA, power amplifiers, and TX power detection circuitry are left outside
Taco.
Taco.
The phone comprises of one single-sided, six–layer PWB. A single multiwall RF shield is
used and this sets the maximum component height to 2.0 mm. An internal antenna is
located on the top of the phone and there is room for a 4.0 mm high ceramic duplexer
under the antenna assembly.
used and this sets the maximum component height to 2.0 mm. An internal antenna is
located on the top of the phone and there is room for a 4.0 mm high ceramic duplexer
under the antenna assembly.
Software Compensations
The following software compensations are required:
• Power levels temperature compensation
• Power levels channel compensation
• Power level reduction due to low battery Voltage
• TX Power Up/Down Ramps
• PA's bias reference currents vs. power, temp and operation mode
• RX IQ DC offsets
• RSSI channel compensation
Main Technical Characteristics
RF Frequency Plan
The RH-42 frequency plan is shown in the following figure. A 19.44 MHz VCTCXO is used
for UHF and VHF PLLs and as a baseband clock signal. All RF locals are generated in PLLs.
for UHF and VHF PLLs and as a baseband clock signal. All RF locals are generated in PLLs.