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Direct Conversion has the ‘Edge’ for SDR Design – CMX994 Operating Range Extended

by david.nunes


Direct Conversion has the ‘Edge’ for SDR Design

CMX994 Operating Range Extended

Maldon, Essex – CML Microcircuits (www.cmlmicro.com), a leading innovator and provider of low-power semiconductors for global wireless and two-way radio communications markets, has increased the operating range of its CMX994 Direct Conversion Receiver.

Through an on-going research and development programme, CML has extended the operating range of the CMX994 Direct Conversion Receiver (DCRx) IC. Now operating over an RF range of 50MHz to 940MHz, the CMX994 now addresses a wider range of Software Defined Radio (SDR) demands.

The CMX994 is a receiver Integrated Circuit (IC) featuring I/Q demodulators intended for use as a direct conversion receiver. The device targets the next generation of multi-mode Software Defined Radios (SDR) for wireless data and two-way radio applications. Its design provides the optimum route for on-board integration, allowing a small RF receiver to be realised with a minimum of external components in both zero IF and low IF systems.

A  DCRx mixes the wanted RF signal down to 0Hz in a single quadrature mixing process using a local oscillator (LO) tuned to the wanted RF channel frequency. Selectivity filtering and gain can now take place at baseband with practical, low power, analogue and digital circuits. DCRx also eliminates the need for an image-reject filter.

The CMX994 DCRx IC offers excellent RF performance, exceptional IP2 from I/Q mixers and is suitable for modulation schemes including: QAM, 4FSK, GMSK and pi/4-DQPSK. Key features of the device include on-chip VCO for VHF applications, on-chip LNA, precision baseband filtering with selectable bandwidths and the smallest PCB area, typically less than 50% of a dual superhet.

The CMX994 is available now, operates at 3.0 – 3.6 V, and comes in a Q4 40-pin VQFN package.

For the Function Image, datasheet, application notes and product support information, visit CML: www.cmlmicro.com.


About CML Microcircuits :

Founded in 1968, CML Microcircuits has developed to become a world-leader in the design, development and supply of low-power analogue, digital and mixed-signal semiconductors for telecommunications systems worldwide.

With its ISO 9001: 2008 certified design, production and marketing facilities and its truly global network of over one-hundred accredited distributors and representatives, CML offers a high-quality product backed by a wealth of design experience; and the on-going availability of ‘local-knowledge’ technical, applications and commercial support. This enables CML, and its customers, to respond to market demands quickly, accurately and cost-effectively.

CML is supportive of conserving the natural environment and aims to manage its operations in ways that are environmentally friendly and economically viable. CML provides RoHS compliant, Lead-free (Pb-free) products.

CML Microcircuits is a member of the CML Microsystems Plc. group of companies.
CML Microcircuits is a founder member of the dPMR and DMR MoU associations.
FirmASIC®, RALCWI™, DuraTALK®, FirmCODEC® and Function Image™ are trademarks of CML Microsystems Plc.




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