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Date: 06-05-12

High fidelity Class-D amplifier technology in CSR's audio solutions

CSR plc has acquired direct digital feedback amplifier (DDFA) technology, a highly scalable digital Class-D audio amplifier technology. The DDFA technology will enable CSR to provide complete, all-digital audio processing pipelines, from source to speakers, for a variety of wireless and wired active speakers, speaker docks, sound bars and other consumer audio products.

"This patented DDFA technology now gives us the unique ability to produce incredibly compact digital power amplifier stages that combine the high energy efficiency of Class D operation with output sound quality that until now has only been possible with the very best linear amplifiers," said Anthony Murray, senior vice president for the home business group at CSR. "With the acquisition of DDFA technology, CSR will be able to provide a complete audio platform solution to address the needs of our customers in existing and emerging new markets for wireless audio. We believe the DDFA technology will enable us to ultimately offer our customers a broad range of truly all-digital audio solutions that deliver significant cost and quality benefits over traditional designs, and which will spark entirely new consumer product categories."

Digital amplifiers based on DDFA technology can achieve THD+N performance levels of less than 0.004% and a dynamic range of 120dB, according to CSR. The DDFA architecture is highly scalable in terms of power output, number of channels and the range of applications it is suitable for. Advanced power management features enable the DDFA architecture to provide intelligent short-circuit protection, programmable clip management, dynamic compression, configurable power and current limiting.

Applications cover the range of consumer audio products, from docking stations, active speakers and sound bars to premium AV receivers, component high-fidelity amplifiers and home entertainment systems.

DDFA technology from CSR is already deployed in consumer audio products.

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