Panasonic GSM EB-A100 Service Manual

– 5-3 –5.1.3. Functional Description■ Frequency PlanThe frequency plan is shown below:Figure 5.2. Receiver Block Frequency PlanTX FrequencyTX Frequency Plan TX IF TX RF LOE-GSM 900 880.2 MHz - 914.8 MHz 88.46 MHz - 114.35 MHz 1459.59 MHz -1543.725 MHzGSM 1800 1710.2 MHz - 1784.8 MHz 90.316 MHz - 104.776 MHz 1354.737 MHz - 1414.482 MHzPCS 1900 1850.2 MHz - 1909.8 MHz 97.379 MHz - 112.341 MHz 1460.684 MHz - 1516.606 MHz■ General■ AntennaEB-A100 uses Helical-type antenna, which is most low-cost, monopole-like antenna. The antenna takes different spacing todefine bands of GSM, DCS and PCS.RF circuit design is built based on SKYWORKS-74963 direction conversion transceiver IC integrated by SAW filters, poweramplifier with control circuit, and Transmitter/receiver switch.RF LO always requires external frequency sources with VCTCXO. And LO frequency is periodically re-tuning to synchronizewith cell or network.FVCO = FRX32kFRXFVCOUHF VCOk = Frequency muliplierWhere k is 1 for low band and 2 for high band.x 1x 2x 2/390°90°RX RF fromLNAFractional-NPLLRX QRX I