飞思卡尔RFX275-30 2.75G RF子系统

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 Freescale的RFX275-30 2.75G RF子系统包括EDGE收发器和功率放大器,为2G EDGE终端提供了完整的高度集成的无线电收发解决方案。它采用CMOS 90nm单片收发器技术,以教小的面积提供天线到比特流的功能.它的主要的元件包括MMM7010 收发器和MMM6028前端功率放大器。本文介绍了它们的主要性能以及子系统的方框图。

  RFX275-30 2.75G RF Subsystem EDGE Transceiver and Power Amplifier The RFX275-30 subsystem provides a highly integrated, comprehensive radio solution for 2G EDGE terminals. This solution offers antenna-to-bits functionality using less board space than the previous generation. It utilizes a CMOS 90 nm-based, single-chip transceiver.

  革命性可编程的方法:

  The RFX275-30 improves on Freescale’s firstgeneration EDGE subsystem with embedded intelligence and simplified layer-one programming. As multiband and multimode phone electronics become more complex and form factors become smaller, simplified programming is key to getting a phone right the first time.

  Traditional RF baseband programming must consider all the critical timing between the transceiver, power amplifiers, switches, low noise amplifiers, baseband processors and voltage regulators. The digital baseband must perform many calibrations to control a transceiver and the detailed timing of all transceiver functions. This interaction results in significant time investment to complete phone development successfully. With Freescale’s revolutionary approach, an engineer enters a single command stating the desired channel and power level. This command sets the parameters and times the events so that system compliance is virtually assured.

  RFX275-30 元件:

  The MMM7010 transceiver and the MMM6028 front-end power amplifier combine to make up the RFX275-30 full radio subsystem. This solution is based on Freescale’s revolutionary polar architecture that delivers an optimal balance of low current, small size and, most importantly, a radio that’s easier to manufacture.

  MMM7010 收发器:

  The MMM7010 is a highly integrated GSM/ GPRS/EDGE transceiver that provides antenna-to-digital bits functionality in a compact 5.2 mm x 6.8 mm package. The transceiver operates over the GSM850, EGSM900, DCS1800 and PCS1900 transmit and receive frequency bands. The MMM7010 transceiver includes a VLIF receive architecture with integrated low-noise amplifiers (LNAs) and a polar modulation transmit architecture with direct phase modulation of the voltage-control oscillator (VCO) by a fractional N synthesizer. Both the receive and transmit VCOs are fully integrated. The polar architecture allows for a filter-free transmit lineup. A timing controller generates appropriate timing events for the transmitter calibration and the transmit/receive bursts, thereby limiting the RF hardware dependency of the baseband layer 1 engine software to an absolute minimum.

  MMM6028 前端功率放大器:

  The MMM6028 is a quad-band Class 45 GSM/GPRS/EDGE power amplifier front-end module (FEM) functioning over the GSM850, EGSM900, DCS1800 and PCS1900 transmit and receive frequency bands. To simplify radio front-end design, the power amplification, power coupling, power detection, low-pass filtering, output power control and antenna switching functions are integrated into the power amplifier FEM. Two modes of power control are supported with the MMM6028: bias control for GMSK modulation and input power control for 8PSK modulation.

  

  主要优点:

  Significantly shorter test and development times with improved final yields

  Complete antenna-to-bits functionality—no separate analog baseband required

  Highest level of integration provides extremely compact board area

  Freescale’s revolutionary Polar architecture provides: Complete closed-loop control for manufacturability ease

  Extremely low current consumption

  Complies with industry-standard DigRF interface for ease of design

  Embedded control provides less dependency on Layer 1 software and simplifies software programming

  RFX275-30 2.75G RF子系统方框图.

  

  主要优点:

  Quad-band: GSM850, EGSM900, DCS1800 and PCS1900

  EDGE Class 45 operation

  GMSK Power Class 4 operation in GSM850 and EGSM900 bands

  GMSK Power Class 1 operation in DCS1800 and PCS1900 bands

  EDGE Power Class E2 operation

  Lowest current consumption

  Direct-conversion/filter-free revolutionary Polar transmitter

  Closed-loop power control

  Streamlined programming model for rapid software implementation

  DigRF interface to digital baseband processor

  Auto-calibrated transmitter

  High immunity to remodulation

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