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Direct quadrature broadband demodulator

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article image Superior quadrature accuracy performance.

SKYWORKS Solutions has introduced a new direct quadrature demodulator with integrated low-noise amplifier (LNA) for the 5GHz band, delivering new levels of integration and performance for standard products in this spectrum.

Given its simplified design, this solution facilitates access to various broadband applications in a low-cost approach.

Available from Caelera , the demodulator provides the flexibility to design receivers for various licensed and unlicensed broadband wireless data systems using low-cost and low-power direct conversion architecture.

In addition, it is an ideal RF solution for the unlicensed WiMAX market, dedicated short range communications, 802.11, 5.8GHz industrial and medical RFID readers, and proprietary wireless data links.

The SKY73013 offers superior quadrature accuracy performance, noise figure and linearity specifications, making the device ideal for even the most difficult modulation formats, including 64-quadrature amplitude modulation (QAM) orthogonal frequency division multiplexing (OFDM).

The internal "no-pull" architecture offsets the voltage-controlled oscillator from the carrier frequency by a factor of 3 to 2. This innovative architecture eliminates LO pulling and dynamic dc offset issues - solving the classic direct conversion radio design challenges, while allowing the use of readily available synthesiser products, including the SKY72302.

The direct demodulator operates from 4.9 to 5.925GHz (at an LO range of 3.2 to 3.9GHz), has a 6dB noise figure, and an input 1dB compression point of -15dBm. The SKY73013 operates at 3.3 volts at a low current consumption of 35mA, over a temperature range of -40°C to +85°C in a 4x4 quad flat no lead (QFN) package.

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