Quad-band GSM GPRS transmit module offers 60% size reduction
TriQuint Semiconductor, Inc. has released a quad-band GSM GPRS transmit module (TQM6M4001) in a small, highly integrated form factor--6 mm x 6 mm x 1.1 mm--offering a 60 percent size reduction for next-generation mobile handset designs.
This module leverages the discrete GSM850/900 and DCS1800/PCS1900 power amplifier (PA) blocks and integrated power control found in current generation power amplifier modules. It then adds the low insertion loss quad-band pHEMT switch, Tx harmonics filtering, integrated switch decoder, four receive ports, and internal ESD protection necessary to implement full RF transmit/receive functionality. The TQM6M4001 requires no external matching and saves customers the need for PA-to-switch design effort. This advancement was achieved in part by eliminating all surface-mount devices (SMDs) inside the laminate-based module, resulting in clear size, cost, reliability and time-to-market advantages.
The TQM6M4001 uses TriQuint's InGaP, GaAs HBT and GaAs PHEMT processes to combine all transmit functions between transceiver output and antenna. These include quad-band InGaP GaAs HBT GSM GPRS power amplifier, quad-band GaAs PHEMT transmit/receive switch, low-pass transmit filter, ESD protection circuitry, and all PA and switch control functions with built-in CMOS-based control IC.
Typical GSM850/900 output power is +34 dBm and GSM850/900 system PAE is 45 percent. Likewise, DCS/PCS output power is +31.5 dBm typical and DCS/PCS system PAE is 42 percent. Dynamic range is rated at 75 dB, while Rx-insertion loss is 0.8 dB in GSM band; 1.0 dB in DCS/PCS band. Input and output impedance is 50 Ohms. No external matching is required. Plus, it is GPRS class 12-compatible and needs no external reference voltage needed. Furthermore, it provides ESD protection circuitry with 8 kV ESD protection (IEC 61400-4-2) at antenna port, and pin-out is aligned to today's most popular GSM GPRS transceivers.
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