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Pegasus 平台 RF 电路培训

Pegasus 平台 RF 电路培训. 2005 01 26 LIBACH. 系统介绍. Pegasus platform( 神马平台) 4-chip solution CX74063:Transceiver( 收发模块) CX77321:PA( 功率放大器模块) CX20524:IA( 集成模拟及电源管理芯片) CX80502:BP( 基带处理器芯片) RF chips: CX74063,CX77321. 系统框图. 系统原理示意简图. 收发模块. CX74063( 收发模块) Transmitter( 发射单元)

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Pegasus 平台 RF 电路培训

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  1. Pegasus平台 RF电路培训 2005 01 26 LIBACH

  2. 系统介绍 Pegasus platform(神马平台) • 4-chip solution CX74063:Transceiver(收发模块) CX77321:PA(功率放大器模块) CX20524:IA(集成模拟及电源管理芯片) CX80502:BP(基带处理器芯片) • RF chips: CX74063,CX77321

  3. 系统框图 系统原理示意简图

  4. 收发模块 CX74063(收发模块) • Transmitter(发射单元) • Receiver(接收单元) • Synthesizer(频率合成单元)

  5. 收发模块

  6. 收发模块 特点: • 直接下变频接收器 • 三频(GSM,DCS,PCS) • DFC (Digital Frequency Centering)数字锁频技术 • 供三频使用的内置本振(LO) • 内置发射压控振荡器(VCO) • 内置PA功率控制电路

  7. 接收通路 接收通路原理示意

  8. 发射通路 发射通路原理示意

  9. CX77321功率放大器 • CX77321 • 小尺寸封装 6mm X 6mm X 1.2mm • 三频 EGSM, DCS and PCS • 支持GPRS class 10(multi slot) 协议

  10. CX77321 - PA 原理框图 VCC= 3.5 v nom (2.9 - 4.8 volts) Driver stages Final stages DCS/PCS IN +6 to +10 dBm Match Match DCS/PCS OUT 0 to +33 dBm Power Control CMOS Bias Controller TxEnable BiCMOS Band Select EGSM IN +6 to +10 dBm EGSM OUT +5 to +35 dBm Match Match • 射频输入输出均为50ohm • 两路独立放大(EGSM,DCS) • 支持三频,GPRS CLASS10 • 高效率: EGSM (53%), DCS (47%) Efficiency Pout (@Vcc=3.5) GSM 53% 35 dBm DCS 47% 33 dBm PCS 47% 33 dBm Pout (@Vcc=3.5) GSM 35.2 dBm DCS 33.2 dBm PCS 33.2 dBm

  11. PA功率控制电路

  12. Airforce平台功率控制电路

  13. Pegasus 平台功率控制电路 • 差分放大器集成到transceiver中,大大减少了外围器件的数目,减小了布板面积

  14. 射频重要线路: • 1. RF 射频线: PLL环路外围线路, PA到 ANT 和ANT到滤波器. • 2. APC 控制线: PAC_Out, APC_CTL. • 3. TX_I/Q 和RX_I/Q信号线. • 4. 19.5MHz crystal/13MHz 信号线. • 5. Vbat line 从电池连接器到PA

  15. QUESTION??? • Question: • 收发器模块主要由哪几部分组成? • 射频部分重要的线路有哪些? • 功率放大器模块的基本特点是什么?

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