产品

OM8827-21

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Product Description

The OM8827-21 Front-End Module (FEM) offers a complete Power Amplifier (PA) and switching/diplexer solution for advanced 2G/3G/4G cellular handsets.

The HBT PAs support quad-band GSM, GPRS, EDGE multi-slot operation and TD-SCDMA and TDD LTE transmission. The FEM provides sixteen dedicated transmit and receive RF switch ports covering all 3G/4G bands from 700 MHz through 2300-2700 MHz. Using a MIPI RFFE interface for PA and switch controls. In support of downlink inter-band Carrier Aggregation (CA) is via 7 LB ports and 9 M/HB ports separated into two switching blocks. Each switch block includes an integrated directional coupler that may be monitored on the CPL port with selectable forward or reverse directionality. A built-in diplexer provides simultaneous LB and M/HB reception required for downlink CA at the single antenna port.

The OM8827-21 providing the linear-GMSK operation standard disables VRAMP input so all PA biasing depends only on MIPI mode selection. The transmitted envelope is a linear function of RF input.

Selecting VRAMP-enabled operation, the PA controller provides VRAMP control of the GMSK envelope and reduces sensitivity to input drive, temperature, power supply, and process variations. In EDGE, TD-SCDMA and TDD LTE linear modes, VRAMP voltage and MIPI-based bias settings optimize PA linearity and efficiency.


Product Features

 LGA: 5.5 mm x 5.5 mm x 0.78 mm (Max.)

 Fully programmable MIPI RFFE control

 16 low loss/high linearity/high isolation TRx switch ports

 High Efficiency (inclusive of coupler and diplexer)

        • 38% GSM850  35% DCS1800

        • 38% GSM900  35% PCS1900

 Integrated broadband directional coupler

 Downlink inter-band CA support with built-in antenna diplexer

 Built-in IEC-compliant antenna ESD protection

 High impedance control inputs and low standby current

 Current limiting and overvoltage protection for ruggedness and extended battery life

 Power control circuitry built-in for improved TRP variation


Applications

        • Cellular handsets encompassing Quad-Band GSM/EDGE, Dual-Band TD-SCDMA, and TDD LTE

        • Class 4 GSM850/900

        • Class 1 DCS1800/PCS1900

        • Class 12 GPRS multi-slot operation

        • Linear EDGE operation

        • TD-SCDMA/TDD-LTE Bands 34/39

        • TDD LTE Band 39

        • Carrier Aggregation (CA)


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Functional Block Diagram

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