Cirrus Logic prevails in key patent infringement suit

Cirrus Logic prevails in key patent infringement suit
Tom Foremski
Cirrus Logic won a key victory with a US jury deciding in its favour in a major patent dispute over Cirrus’ Delta Sigma technology which covers the conversion of analogue signals to digital.
The jury found that the patents were valid and that Opti and Tritech Microelectronics infringed on Cirrus patents with Tritech’s infringement judged wilful. Cirrus said it will ask the court for an injunction that will bar the sale in the US of Opti and Tritech products using its technology.
“Obviously, we are pleased by the victory,” said Cirrus CEO David French. “Our portfolio of over 850 United States patents is one of our company’s most important assets. We intend to defend our markets by vigorously asserting this intellectual property against infringing competitors. Over 50 of these patents are in the Delta Sigma area.”
Delta Sigma technology is widely used in A/D and D/A converters and Cirrus sees considerable potential for the technology in system-on-a-chip products in high volume consumer electronics products.

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