Analog Devices embeds VCOs on GSM/GPRS transceiver chip
Analog Devices embeds VCOs on GSM/GPRS transceiver chip
By Robert Keenan, EE Times
March 13, 2003 (6:56 a.m. EST)
URL: http://www.eetimes.com/story/OEG20030311S0020
ROCHESTER, N.Y. Analog Devices Inc. is again looking to bring higher levels of integration to the RF front end of mobile phone designs with the release today (March 11) of a new member in its Othello transceiver family. To be unveiled at next week's CTIA Wireless '03 show, the AD6539 direct-conversion transceiver brings in the local oscillator VCO as well as the transmit VCO, both of which served as off-chip components in previous revisions of the transceiver. The AD6539 has been optimized specifically for handsets supporting GPRS/GSM functionality. In addition to the integrated VCOs, the chip comes complete with four low noise amplifier inputs, power management circuitry, and a fractional-N phase-locked loop synthesizer. Analog Devices said it would offer the chip in two versions. The first, dubbed the AD6539L is optimized to work specifically with Analog Devices X-PA family of power amps, which come equipped with integrated power de tectors/controllers. The second version, the AD6539, includes a power control loop, making it a better solution for working with third-party power amps not delivering integrated power control circuitry. The AD6539 and AD6539L are both sampling now, with production scheduled for mid-2003. Pricing for both products is less than $5 in 10,000-unit quantities.
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