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Zarlink radio module integrates receiver, transmit functions

Posted: 13 Dec 2002 ?? ?Print Version ?Bookmark and Share

Keywords:zarlink semiconductor? zl20200? radio transceiver? tdma transceiver? amps transceiver?

The ZL20200 radio transceiver from Zarlink Semiconductor Inc., which is touted to be the first commercial device to successfully integrate call receiver and call transmit circuitry in a single chip, effectively reducing the size and cost of the radio portion of a TDMA or AMPS cellphone.

Designed using an advanced SiGe BiCMOS process, the 8-by-8mm, 56-pin MLP eliminates at least 35 separate components, shrinks the radio "footprint" by up to 40 percent, and reduces the BOM cost by up to 20 percent.

The receiver part of the IC mixes incoming IF voice signals with synthesized local oscillator signals from an on-chip VHF VCO, and downconverts them to the baseband frequency. The receiver deliver 100dB of gain control, handles AMPS FM demodulation, and includes baseband filters.

The transmitter portion of the ZL20200 is linear circuit with a quadrature modulator, IF gain control, and a single-ended output. The single-ended output delivers enough power to directly drive a two-stage power amplifier, eliminating the need for an external balun transformer.

The ZL20200 uses a fractional-N synthesizer to control the UHF VCO, which improves reception by ensuring RF channels are tuned rapidly and accurately.

The transceiver operates in the 850MHz band in TDMA and AMPS modes, and in the 1.9GHz PCS band in TDMA mode. The chip is fully compliant with the TIA/EIA IS-136 specification.

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