Nokia Ringo2 RF Block

After Sales Technical Documentation

NHN–3N Series Transceivers

Chapter 1

RF Block

Original 43/96

NHN–3N

After Sales

RF Block

Technical Documentation

CONTENTS

Introduction 4 – 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Technical Summary 4 – 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Functional Description 4 – 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Basic Specifications 4 – 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Module Characteristics 4 – 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Maximum ratings 4 – 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DC Characteristics 4 – 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Connections 4 – 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Connections to Baseband module 4 – 4. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Digital control signal values 4 – 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Block diagram 4 – 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

RF components 4 – 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Receiver 4 – 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

RX Synthesizer 4 – 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

RX loop filter 4 – 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TX Synthesizer 4 – 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TX Loop Filter 4 – 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Transmitter 4 – 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Regulators 4 – 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AFC function 4 – 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Parts List of JR8 EDMS Issue 3.2 4 – 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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After Sales

NHN–3N

Technical Documentation

Introduction

Technical Summary
Functional Description

The RF module is designed for handportable cellular phone which oper­ates in the NMT900 system. The purpose of the module is to receive and
demodulate the radio frequency signal from base station and transmit
modulated RF signal to base station.

RF module is constructed on a 1.0 mm thick FR4 four–layer Printed Wire
Board. Dimensions of the PWB are 142 mm x 48 mm.

EMC leakage is prevented with magnesium shield on component side.

RF Block

Basic Specifications

Parameter Value

RX frequency band 935.0125 – 959.9875 MHz
TX frequency band 890.0125 – 914.9875 MHz
RX LO frequency band 980.0125 – 1004.9875 MHz
Duplex spacing 45 MHz
Channel numbers 1 – 1000, 1025 – 2023
Number of channels 1999
Channel spacing 12.5/25 kHz
TX output power 0.1 W low power, 0.55 W high power
Method of frequency synthesis Dual PLL with two UHF signals for RX LO and

TX
Frequency control AFC with +/– 2.5 kHz limits
Receiver type Superheterodyne with double IF
Modulator type FM–modulator
Current consumption, reception 63 mA
Current consumption, standby
Current consumption, transmission 570 mA

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After Sales

RF Block

Technical Documentation

Module Characteristics

Maximum ratings

The maximum battery voltage during transmission should not exceed 6.0
V. Higher battery voltages may destroy the power amplifier module.

Parameter Value

Battery voltage nom. 4.8 V, min. 4.5 V, max. 6.0 V,
Regulated supply voltage 3.6 V +/– 5 %
Operating temperature range –25 ... +55 deg.C

DC Characteristics
Regulators

There are two regulators in the RF unit. Regulators get their reference
voltages 3.3 V (Vref) from BB unit. Regulators regulate the battery voltage
to the fixed 3.6 V level.

Control Signals

In the following table the RF current consumption can be seen with differ­ent status of the control signals. RX and TX synthesizer phase locked
loops are switched on/off by a control byte of PLL circuit.

RXE + SW power­up for RX synthe-

sizer

H H H 550 mA Power Level 2
H H L 84 mA
H L L 47 mA Synthesizer TX part

L L L 1 mA All RF parts have

TXS + SW power­up for TX synthe-

sizer

TXE Typical Current

Consumption /mA

has been powered
off

been powered off

Connections

Connections to Baseband module

Signal Name Type Function

Note

AFC Analog out The reference oscillator frequency adjust.

AGC Digital out Receiver gain control. Active state: High

DAF Analog in Demodulated received signal (audio + fii+ data)

GND Power Common ground

IF Analog out 2nd IF signal (450 kHz)

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Technical Documentation

FunctionTypeSignal Name

MOD Analog out Modulation signal for transmitter (audio + fii + data)

RFTEMP Analog in Main crystal temperature.

RSSI Analog in Received signal strength indicator. Voltage measurement.

RXE Digital out Receiver enable, Active state: High
SCLK Digital out Serial clock for synthesizer. Active state: Rising edge
SDAT Digital out Serial data for synthesizer. Active state: High

SLE Digital out Synthesizer latch enable
TXC PWM out Transmitter power control
TXE Digital out Transmitter enable. Active state: High

TXI Analog in ”TX power on” –indicator

TXS Digital out TX synthesizer enable. Active state: High

VBAT Power Battery voltage to transmitter

VRF Power Battery voltage to regulator

RF Block

VREF Power Reference voltage

Digital control signal values

Supply voltage VDD 3.3 V
Logical 1 VOH >VDD*0,7
Logical 0 VOL <VDD*0,3
Logical 1 IOH <1mA , 1A (typical)
Logical 0 IOL <1mA , 1A (typical)

AFC VCTCXO control voltage

Type analog signal (DC–level)
Level 0.3...3,0 V DC
Source impedance Zs < 1.5 kohm
Load impedance ZL > 10 kohm
Control step size for TX freq. 100 Hz (typical)

AGC Receiver gain control

Type Digital signal
Function 0 = AGC off

1 = AGC on

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NHN–3N

After Sales

RF Block

DAF Demodulated audio and data

signal

Type analog signal
Nominal level 50 mVrms @3,0 kHz deviation
Unit to unit variation 35 mV...65 mV
Source impedance ZS < 5 kohm
Load impedance ZL > 50 kohm

IF 450 kHz 2nd IF signal

Level 250 mVpp (typical) not speci-

Source impedance < 10 k W
Load impedance > 50 k W

Technical Documentation

fied by manufacturer

MOD Modulation signal for trans-

mitter (Audio + data)

Type Analog signal
Nominal level 300 mVpp @3,0 kHz deviation
Load impedance ZL > 10 kW
Source impedance Zs < 5 kW

RFTEMP VCTCXO temperature

Type analog signal
Level 0...3,3 V DC
Temp. range –25...+55 degrees centigrade

RSSI Received signal strength in-

dicator

DC–level 0.2...3.0 V
Source impedance 56 kW (typical)

RXE Receiver enable

Type Digital signal
Function 0 = RX off

1 = RX on

On–state current 150 mA (typical) (300 mA max.)

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Technical Documentation

SCLK Serial clock for synthesizer

Type digital signal
Pulse width > 1 us

SLE Synthesizer enable

Type Digital signal

TXC Transmitter power control

Type PWM signal
Function Duty cycle of the TXC signal

defines the TX power level

PWM frequency 5 kHz

RF Block

Level 0...3.3 V DC
Number of duty cycle steps 256
Load impedance > 100 kohm

TXE Transmitter on/off control

Type Digital signal
Function 0 = TX off

1 = TX on

TXI ”TX power on” –indicator

Type Analog signal
Source impedance > 47 kW
Level < 1 V = TX off

> 1 V = TX on

TXS TX synthesizer on/off

Type Digital signal
Function 0 = Supply off

1 = Supply on

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