RF measurement fundamentals.pdf

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1、RFmeasurementfundamentalsRevPA11Contents•Basiccommunicationconcept•Productstructure•Instrumentsintroduction•TestitemsRevPA12Basiccommunicationconcept•*DivisionMultipleAccess•*DivisionDuplex•I-QModulation•TransceiverschematicRevPA13Basiccommunicationconce

2、pt多址方式Pwr/Pwr/tCodetCodefffTDMATDMA/CDMACDMARevPA14BasiccommunicationconceptRevPA15Basiccommunicationconcept双工方式tPwr/Pwr/CodeCodefTDDfFDDtFDD+TDDfRevPA16BasiccommunicationconceptRevPA17Basiccommunicationconcept调制方式RevPA18BasiccommunicationconceptGSM•GSM使

3、用了TDMA和FDMA的复用方式•GSM900分为1-124CH，GSM1800分为512-885CH，每个信道200kHz，每个ARFCN分为8个时隙。•P-GSM900手机发：890～915MHz；手机收：935～960MHz。•E-GSM900手机发：880～915MHz；手机收：925～960MHz。•DCS1800手机发：1710～1785MHz；手机收：1805～1880MHz。•GSM的调制方式是BT=0.3的GMSK，调制速率为270.833千波特，0.3表示了高斯滤波器的带宽和比特率之

4、间的关系。RevPA19BasiccommunicationconceptRevPA110Basiccommunicationconcept收发信机框图RevPA111Productstructure•GSMDRU•WCDMARRU-TX/RX-DohertyPA-DPD-FU•TD-SCDMARRU-TX/DUC/CFR-RX/DDC-FURevPA112ProductstructureGSMDRUDRUUC/HCTestY-linkRadioPCBFilterunitIsolatorDSTMACPU

5、TaracPPPWR1PowerGarpAAntXTX11DuplexTemp.FiltersenseBias-TIsolatorPATX2Temp.senseHybridTMALoadLNAAntPWR2RX12DuplexFilterBias-TRXLNA2LLNNAARXRXRXin2Rxout2in1out1RevPA113GSMDRUTXProductstructureDIRACDIRAC513MHz513MHzRFLOARFLOBFinjaPennySpira2RFLoopIFLO(ToRX

6、)/212IIQ12D/ADIRACQ513MHzDIRAC3DIRACTXLowOut(ToPA)23DIRACSPIRA55BUSDIRAC33TrimD/A:S/PDIRACS/P4(4)•PABIASCOARSED/A•PABIASFINEMeasurementA/D:•DRIVERBIASCOARSE•PATEMP•DRIVERBIASFINE•GND(A/DRESET)A/D•ISOLATORLOADTEMP8(8)•PA30VMEAS•PADETFWD•COMBUNBALMEAS(TX1O

7、NLY)•TXINTVOLT•RXTEMPRevPA114Productstructure18dB32dB3030V-0.5dBV900:-0.19dBDRIVER-1dB1800:-0.20dBIsolatorTx1outTXLOWAMPLIFIERCOUPLERPA-0.1~-0.2dBOUT(RFIC)20dB(ToFU)ARPATTENUATORPOWEROUT1dBAMPLIFIERDRF-1.3~-1.4dBPADETRFFWDDETECT3030VVDRIVERIsolatorTx2out

8、TXLOWAMPLIFIERCOUPLER(ToFU)(RFIC)20dBOUTPOWERAMPLIFIERDRFTXLOWLEVELRFPADETDETECTCombinerFWDloadCOMBINERCOMBUNBALRFLOADMEASDETECTATTENUATORRevPA115ProductstructureGSMDRURXY-linkCPUDSP&RCRXFront-EndDRFDIGITALRXIF1FILTERSRid1