Product Description

The OM8828-21 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 16 TX/RX RF switch ports covering all 3G/4G bands from 700MHz through 2300-2700MHz. The OM8828-21  uses a  MIPI  RFFE  interface for  PA and switch controls. With support of downlink inter-band Carrier Aggregation (CA), three switching blocks separated into 7 LB ports, 5 MB ports and 7 HB ports. Each switch block has 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 MB reception required for downlink CA at the single antenna port ANT_LM. The high band has the dedicated antenna port ANT_H.

The OM8828-21 provides the support both for the linear-GMSK mode and VRAMP-based mode operation. A MIPI RFFE controller operates all functions including selection of PA band/Mode/Bias and Switch configuration. Selecting VRAMP-enabled operation, the PA controller provides VRAMP control of the GMSK envelope and reduces sensitivity to input drive, temperature,  power supply.  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 0.72 mm

► 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

► Tx harmonics below –40 dBm

► 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


        •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)


Figure 1 Functional Block Diagram

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