Design; Software Compensations; Main Technical Characteristics; Rf Frequency Plan - Nokia RH-41 Series Technical Documentation Manual

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CCS Technical Documentation

1900 MHz bands, with measuring capability for cross-band hand-off and maho-mea-

surements.

Design

The RF design is centered around the Taco RF-IC. Taco consists of receivers, transmitter IF

parts, highband TX upconverter, lowband TX upconverter, and all PLLs, lowband LNA, TX

VHF VCO active part, and loopfilter.

RF filtering, 2G LNA, power amplifiers, and TX power detection circuitry are left outside

Taco.

The phone is comprised 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.

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

The RH-41 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.

Issue 2 09/2003

Nokia Corporation

Confidential

RH-41

System Module

Page 41

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