RF transceiver integration

Royal Philips Electronics today announced a new single-chip Radio Frequency transceiver for 2G and 2.5G mobile phones that supports up to quad-band, GSM/GPRS and full EDGE transmit/receive operations.

Royal Philips Electronics today announced a new single-chip Radio Frequency (RF) transceiver for 2G and 2.5G mobile phones that supports up to quad-band, GSM/GPRS and full EDGE transmit/receive operations.

The UAA3537 uses Philips’ N-ZIF (Near-Zero Intermediate Frequency) architecture for the receive channel, and a totally new direct up-conversion architecture for the transmit channel. For the first time, Philips says, this brings EDGE transmit functionality within the scope of a guaranteed single-chip solution.

The new chip also eliminates expensive Surface Acoustic Wave (SAW) filters from the design, keeping external component count to a minimum. Four integrated programmable LNAs (Low Noise Amplifiers) in the receive channel enable designers to configure the phone for quad-band operation at 850 MHz, 900 MHz, 1800 MHz and 1900 MHz, or for dual-band or triple-band combinations of these frequencies.

The UAA3537’s N-ZIF receiver has a gain control range of over 68 dB, and its direct up-conversion transmitter achieves a noise performance of -163 dBc/Hz at 20 MHz offset, eliminating the need for a SAW filter between the transceiver chip and the handset’s RF power amplifier.

Among the many other functions integrated into the UAA3537 is a fully integrated fractional N frequency synthesiser with AFC control, and integrated VCOs and VCO supply regulators. In addition, the UAA3537 contains most of the circuitry required to generate a reference clock, which can also be used to drive Philips’ 3G chip-set (the UAA3580/ UAA3581/UAA3592) in 2.5/3G dual-mode phones in order to achieve cross-mode synchronisation and optimisation.

The UAA3537 operates over a supply voltage range of 2.4 V to 3.0 V, and is housed in a 6 x 6 mm HVQFN package.

Samples of the UAA3537 are available now, together with complete reference designs for triple-band GSM and full EDGE RX/TX applications. Volume production of the UAA3537 is scheduled for Q2 2003.