User Guide

Nokia Customer Care System Module

6015/6015i/6016i/6019i (RH-55), 6012 (RM-20)

For the PCS band, the channel spacing and comparison frequency are both 50 KHz. For

the Cell band, the channel spacing and comparison frequency are both 30 kHz. The

reference oscillator to the UHF synthesizer is 19.2MHz, and the reference divide ratio is

384 and 640 for Cell and PCS.

RX VHF Synthesizer

The RX VHF synthesizer is integrated within the Batman RFIC and generates the LO

signals for the IQ demodulator. The synthesizer has an internal VCO with an external

resonator and a dual-modulus prescaler type. The prescaler utilizes a phase detector with

a charge pump that sinks or sources currents, depending on the phase difference

between the detector input signals.

The RX VHF synthesizer generates 256.2 MHz for both the Cell and PCS bands. The RX

VHF synthesizer comparison frequency for both the Cell and PCS bands is 150 kHz. The

reference oscillator to the RX VHF synthesizer is a 19.2 MHz VCTCXO. The reference

divide ratio is 128 for both the Cell and PCS bands.

TX UHF Synthesizer

The TX UHF synthesizer section in Jupiter consists of a fully-programmable RF PLL. The

PLL contains the following:

• High-frequency, dual-modulus prescaler

• A- and B-counter with dual-modulus control logic

• Reference- (R-) counter

• Phase detector (PD) with charge pump (CP) output

The synthesizer is controlled via the common serial 3-wire interface (CLOCK, DATA,

ENABLE). The reference frequency is applied at the FREF-input and divided by the

R-counter.

The reference input frequency is 19.2 MHz. The RF frequency of the on-chip VCO is

divided by the 64/65 (RF) divide ratio prescaler and the following programmable

B/A-counters. The RF frequency value is optimized for dual-band CDMA operation. The

phase and frequency detector with the charge pump has a linear operating range

without a dead zone for very small phase deviations.

The LO frequency can be programmed in 120 kHz steps to achieve 30 KHz Channel

spacing over the complete cellular TX band. For operation in the PCS band, the internal

VCO runs at double the TX frequency. The LO frequency can be programmed in 100 kHz

steps to achieve a 50 kHz channel spacing over the complete PCS TX band. For Cellular

operation, the internal VCO runs at four times the TX frequency. The LO frequency can be

programmed in 120 kHz steps to achieve 30 kHz channel spacing over the complete

Cellular TX band. For operation in the PCS band, the internal VCO runs at double the TX

frequency. The LO frequency can be programmed in 100 kHz steps to achieve a 50 kHz

channel spacing over the complete PCS TX band.