comment on this article

Direct conversion I/Q demodulator

Direct conversion I/Q demodulator
Direct conversion I/Q demodulator

Low power semiconductor specialist, CML Microcircuits has added a new Direct Conversion Receiver IC (DCRx) to its family of rf integrated circuits.

The CMX994 targets the next generation of multimode Software Defined Radios (SDR) for wireless data and two way radio applications. Its design is said to provide 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.

Until recently, most radios have used the superheterodyne (Superhet) receiver, however enhancements in semiconductor technology have enabled the integration of DCRx. 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.

Key features of the CMX994 include on chip VCO for VHF applications, an operating range of 100MHz to 600MHz, precision baseband filtering with selectable bandwidths and the smallest pcb area, typically less than 50% of a dual superhet. Another feature is the single ended rf connections meaning no baluns are required.

According to CML, the small size and flexibility of Direct Conversion make it a key element for the next generation of multimode SDRs for wireless data and digital two way radio applications.

The CMX994 is available now, operates at 3 to 3.6V and comes in a Q4 40pin VQFN package.

Author
CML Microcircuits

Comment on this article


This material is protected by Findlay Media copyright See Terms and Conditions. One-off usage is permitted but bulk copying is not. For multiple copies contact the sales team.

Enjoy this story? People who read this article also read...

What you think about this article:


Add your comments

Name
 
Email
 
Comments
 

Your comments/feedback may be edited prior to publishing. Not all entries will be published.
Please view our Terms and Conditions before leaving a comment.

Related Articles

Security in the IoT

Although it has been with us in some form and under different names for many ...

Broadband RF VGA

IDT has introduced the F0480, an internally matched 400 to 2700MHz broadband RF ...

6LoWPAN tutorial

A tutorial of what 6LoWPAN is and how it connects to the internet.

What is 5G?

Samsung Electronics has announced two industry first milestones in the ...

Andy Start interview

What does the British president of the US multinational operation think about ...