RF Micro Devices' Polaris Total Radio solution is a highly integrated radio transceiver for GSM and GPRS applications. According to the company, the chipset performs all functions associated with the RF section of a handset and provides handset manufacturers the benefits of reduced component count, flexible baseband interfaces and lower cost of implementation.
The Polaris transceiver is comprised of the RF6001 mixed-signal processor, the RF3133 power amplifier module with integrated power control and either of two new receivers - the RF2710 or RF2716. Both the RF2710 and RF2716 add quad-band functionality to the Polaris transceiver; the RF2716 also offers a direct conversion mode, supporting E-GPRS receive capability.
The quad-band Polaris transceiver supports the US cellular (850 MHz), GSM (900 MHz), DCS (1800 MHz) and PCS (1900 MHz) frequency bands and consists of the following components:
* RF2710 or RF2716 - The SiGe BiCMOS quad-band receivers feature a polyphase down-converting mixer, a bandpass filter and DC offset correction. Both devices are offered in a 5 x 5 mm leadless plastic package.
* RF6001 - The CMOS mixed signal processor includes digital channel filters, a fractional-N frequency synthesizer, a digital GMSK modulator and an integrated power ramp DAC. It comes in a 7 x 7 mm leadless plastic package.
* RF3133 - One of RFMD's second-generation PowerStar power amplifier modules with integrated power control circuitry, the RF3133 features internal matching components. The device comes in a 7 x 10 mm leadless plastic package.
The Polaris transceiver exceeds ETSI specification requirements and features enhanced receiver sensitivity, as well as the ability to handle EDGE modulated signals, according to RFMD. High integration in both the transmit and receive functions reduces the number of components required to implement a complete GSM/GPRS radio. All VCOs, associated loop filters and many of the power supply bypass capacitors are integrated on silicon. It offers both very low intermediate frequency and direct conversion modes of operation, eliminating all IF SAW filters. The transceiver also provides selectable digital baseband interfaces on both receive and transmit paths enabling direct interface to emerging digital baseband products.
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| www: | www.rfdesign.co.za |
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