1. Galaxy H/W Training - GPRS RF Part ASUS RD Division IA Department HW-2 Group Alan Lin 2006/01/23

2. 2 Agenda Introduce to GPRS Function - Block Diagram - Key Parts List - Aero II Architecture Highlights - Transmitter - Receiver Trouble Shooting - Ckt. & Location - AFC - APC - AGC

3. Introduce to GPRS Function Introduce to GPRS Function

4. 4 GPRS Block Diagram T/R SW PA RF ChipBB Chip PMIC Flash RF Part BB Part PDA Part FFUART Analog IQ Pink :GPRS RF Green : GPRS Base-Band Blue :PDA

5. 5 Transceiver Block Diagram RF3166 850: 856441 900: 856387 1800: 856409 1900: 856417 LMSP33QA-321

6. 6 Base-band Block Diagram 3 wire bus for RF transceiver RF Control T/R switch Analog IQ signal Audio RX path Audio TX path SIM

7. 7 Key Parts List

8. 8 Aero II RX Highlights Low IF architecture strengths (200kHz IF) –Has advantages of Super-Heterodyne architectures : –DC Offsets are located outside the band of interest. –IP2 (AM Suppression) requirements are relaxed. –LO Self Mixing is not a problem. –Has advantages of Direct Conversion architectures : –No IF SAW Filter required – Image Rejection requirements are simplified. –Single analog down-conversion stage. –IF Analog Signal Processing is at a low frequency. –Digital IF signal processing.

9. 9 Transceiver Functional Block RX SAW RX Loop Universal Baseband Interface (DAC) Power Amp. TX Loop Synthesizer XTAL(DCXO)

10. 10 Receiver Block Diagram Image Reject Low - IF Receiver

11. 11 Low-IF Receiver

12. 12 Image Rejection

13. 13 Aero II TX Highlights Offset PLL architecture –Band Pass Noise Transfer Function attenuates noise in RX band. –TXVCO is a constant-envelope signal that reduces the problem of spectral spreading caused by non-linearity in the PA. –Eliminates need for TX SAW Filter. TX transmit out buffer –Helps eliminate spurs and pulling issues.

14. 14 Transmitter Block Diagram Offset PLL

15. 15 Offset PLL - The OPLL acts as a tracking band-pass filter tuned to the desired channel frequency. - The important difference between a PLL and the OPLL is that the frequency modulation of the reference input is reproduced at the output of the Tx-VCO without scaling Advantage - Low noise floor and spurs - Pulling of the transmit VCO is reduced -Truly constant envelope Output from VCO Disadvantage - Only possible with constant envelope modulation scheme

16. 16 DCXO Architecture Frequency adjusted by two variable capacitances - Cdac: coarse tuning - Cafc: fine tuning

17. Trouble Shooting Trouble Shooting

18. 18 Measurement Equipment Agilent 8960 / CMU200 Power Supply Scope Spectrum Passive Probe with DC Block

19. 19 Base Station Setup Base Station Test Mode Setup

20. 20 Antenna Switch Connector Bottom Side

21. 21 PA & Front-end Top Side T/R Switch High band Matching PA Low band Matching

22. 22 PA & Front-end PALEVEL (VRAMP) High band Matching Low band Matching T/R Switching PA

23. 23 RX Path Top Side T/R Switch RX SAW Transceiver XTAL

24. 24 RX Path RX SAW T/R Switching Transceiver XTAL

25. 25 T/R Control Table

26. 26 Trouble Shooting AFC Fail APC Fail AGC Fail ORFS due to Modulation Fail @ -200kHz & +400kHz fail Others

27. 27 AFC & TX Testing Nodes A B C D E F H G

28. 28 AFC Fail Check antenna switch connector Check Vramp & PA output power Check 26MHz output PA

29. 29 APC Fail If TX current is right - Check antenna switch connector - Check T/R switch - Check PA matching circuit T/R SW Low-band in Low-band out Vramp High-band in High-band out

30. 30 APC Fail If TX current is small - Check TXVCO output - Check Vramp - Check PA - Check VBAT T/R SW Low-band in Low-band out Vramp High-band in High-band out

31. 31 AFC & TX Signals

32. 32 26MHz & TXIQ Fig. 1.1 26MHz Fig. 1.2 TXIQ

33. 33TXVCO Fig. 1.3 TXVCO DCS Ch700 : 1747.8MHzFig. 1.4 PA Out DCS Ch700 : 1747.8MHz

34. 34Vramp Fig. 1.5 Vramp

35. 35 RX Testing Nodes A B E D C F

36. 36 AGC Fail Check antenna switch connector Check T/R switch Check SAW Check RXIQ RX SAW

37. 37 RX Signals

38. 38 26MHz & T/R Switch Out Fig. 2.1 26MHzFig. 2.2 EGSM Ch62 : 947.4MHz

39. 39 RX IQ Fig. 2.5 RX IQ