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Product Description
The OM8820-21 is a high-power, high-efficiency Front-End Module for GSM850/EGSM900, DCS1800 and PCS1900 operation. The FEM supports Class12 General Packet Radio Service (GPRS), EDGE multi-slot operation, and dual band TD-SCDMA/TD-LTE linear transmission. This FEM builds upon OnMicro's unique power amplifier architecture technology to provide maximum efficiency and output power, integrated over-current and over-voltage regulating technology stable ruggedness and TRP performance under load mismatch.
The module provides 50 Ω impedance at input and output ports, consists of a CMOS Controller, a RF switch with integrated Tx low pass harmonic filtering can achieve best harmonic performance. The OM8820-21 supports both the linear-GMSK operation standard and VRAMP-BASED operation facilitating various platforms application implementation. For dual antenna handset designs, the OM8820-21 has dedicated LB and M/HB antenna ports that provide simultaneous LB and M/HB reception required for downlink CA. Alternatively, downlink CA can be supported by an external diplexer for single antenna handset designs.
This FEM can sustain 8KV ESD at Antenna port, without external components needed, and also guarantee robust 12:1 VSWR on Antenna Port under load mismatch condition.
Product Features
► LGA: 5.5 mm x 5.5 mm x 0.78 mm (Max.)
► Fully programmable MIPI RFFE control
► 15 low loss/high linearity/high isolation TRx switch ports
► High Efficiency
• 38% GSM850 35% DCS1800
• 38% EGSM900 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
Applications
• Cellular handsets encompassing Quad-Band GSM/EDGE, Dual-Band TD-SCDMA, and TDD LTE
• Class 4 GSM850/EGSM900
• 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)
Functional Block Diagram