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Product Description
The OM8827-22 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 OM8827-22 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 30% DCS1800
• 35% GSM900 30% 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)
Figure 1. Functional Block Diagram