SUNNYVALE, CALIF. Philips Semiconductors has launched a single-chip, triple-band, General Packet Radio Service (GPRS) Class 12 RF transceiver based on the near-zero intermediate frequency (N-ZIF) architecture. Philips claims it is among the first companies to develop the N-ZIF architecture for GSM applications.
The UAA3535 targets mobile phones that handle voice and high-speed data on GSM networks, providing e-mail, Internet and file-transfer connectivity. It meets all European, North American and Far East GSM band requirements.
Yvan Droinet, international product marketing manager for RF products, said Philips has replaced the conventional IF configuration, which requires the use of an expensive external SAW filter, with a single-conversion alternative that can be done entirely on-chip.
The N-ZIF architecture for triple-band GSM900/1800/1900 GPRS Class 12 handsets integrates an IF channel filter with a high dynamic range, a low-noise amplifier with an image-rejecting front end, and frequency synthesizers and a transmit offset loop with integrated filters.
Droinet said that compared with the zero-IF architecture, N-ZIF has a lower RF development cost, and time and manufacturing advantages.
"Besides providing simplified signal processing for GSM applications, its high integration level provides significant cost and size reductions," he said.
The part operates at 2.5 volts, interfaces to standard analog-to-digital converters and requires few external components. The chip is manufactured in Philips' Qubic3 0.5-micron BiCMOS process.
The UAA3535 is packaged in an LQFP48 and is priced at $8 in 100,000-unit quantities.
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EETInfo No. 606