The stIF filter is a SAW filter material code Input and output are balanced Input is however used as single ended The

Technical Documentation System Module Receiver IF circuit, RX part of CRFRT The receiver part of CRFRT consists of an AGC amplifier, a mixer and a buffer amplifier for the second IF. The mixer circuit down converts the received signal to the 13 MHz IF frequency. After 2nd-IF filter the signal is amplified and fed to baseband circuitry. The supply current can be switched on and off with an external switch. (material code 4370091.) Max output level after 2nd IF buffer

Functional Description

The RPE-1 can use either 5V or 3.3V power from the PCMCIA slot of the host computer. The optimal performance is reached when the supply voltage is 3.3V. In 5.25V supply unnecessary heat dissipation is generated. CIS information is read in 5V voltage mode from the SMART ASIC. After CIS reading the host computer can continue in 5V mode or change to 3.3V mode. The baseband section is powered by a 200mA regulator, which regulates the PCMCIAslot voltage 3.3-5.25V to 3.0V. A 100mA dc dc converter is...

Chapter Transceiver Overview Contents

Block Diagram of RF System Module GX8 Page 3-6 3-13 Operating modes and interface signals of the RPE-1 . Page 3-13 Supply Voltages and Power Consumption Page 3-15 Operating Current average values 3-15 System Module Technical Documentation SMART - MAD2 Interface Signals Page 3-20 Power Distribution Block Diagram 3-24 3-27 3-28 3-29 3-32 3-33 Transmitter Power Budget. From PA to Antenna Page 3-34 3-36 Receiver IF circuit, RX part of CRFRT Page 3-39 Modulator circuit, TX part of the CRFRT Page...

Technical Summary

The Nokia Cellular Card Phone RPE-1 hardware comprises four basic functional blocks - 2 RF, a low power and low profile derivative from DCT2 HD843 - 3 BB, mixed DCT2 RFI2 and DCT3 MAD2 - 4 Host interface system control through RPE-1 specific ASIC SMART Block Diagram of RF System Module GX8 The RPE-1 is a GSM phase I type approved cellular telephone with maximum output power of 0.8W power class 5 . The following GSM services are supported - non-transparent and transparent data, The RPE-1...

Crystal oscillator

The crystal oscillator is a VCTCXO, voltage controlled temperature compensated crystal oscillator. part code 4510181 . ppm, -25 75 deg.C ppm, 4.7 V - 5 ppm, load - 10 ppm, year Technical Documentation System Module The VHF PLL consists of the VHF VCO, PLL integrated circuit and loop filter. Sidebands - 1 MHz - 2 MHz - 3 MHz gt 4 MHz The VHF VCO uses a bipolar transistor as an active element and a combination of a chip coil and varactor diode as a resonance circuit. The buffer is combined into...

Block Diagram of RPE

Technical Documentation System Module All digital activity to external hosts go through the PCMCIA interface. This interface is handled by the SMART ASIC. In the SMART ASIC the PCMCIA interface section VCC is the PCMCIA connector VCC. The SMART ASIC uses three independent supply voltages - for SIM interface VSIM supply, - for PCMCIA interface VCC supply and - for SMART ASIC core VCCARD supply. The interface has two operating modes one for PCMCIA compliant computer hosts and one for non-PCMCIA...

Functional Description Receiver

Nokia Nhx 2nd Schematic Diagram

The antenna switch connector connects an antenna or a cable to the PCB. Fixed to the PC Card mechanics, the connector's function is also to launch the received signal from antenna to the microstrip environment on PCB. The microstrip takes the received signal first to the duplex filter, that passes the signal to the receive RX arm of the transceiver. Another function of the duplex filter is to reject the RF spectrum outside the RX band. The signal is then amplified by a low noise preamplifier....