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CSR or Cambridge Silicon Radio, is a company based in Cambridge, England.
CSR is a fabless semiconductor company whose main product lines include connectivity, audio and location chips. and is the 15th largest fabless semiconductor company in the world by 2009 revenue
1998 The Company was founded when it split away from Cambridge Consultants as Cambridge Silicon Radio.
2004 It was first listed on the London Stock Exchange
In 2005 the Company acquired Clarity Technologies, a leading Clear Voice Capture (CVC) business.
In 2005 CSR also acquired the 3G wireless (WCDMA/UMTS/HSDPA) technology company UbiNetics.
In 2007, CSR acquired Nordnav, a Swedish based GPS software company, and CPS, a Cambridge based GPS software company producing Enhanced GPS in partnership with Motorola.
On 10 February 2009, CSR announced it was merging with SiRF, the biggest global supplier of GPS chips, in a share deal worth $136 million.
On 21 February 2011, CSR announced it was merging with Zoran, a video and imaging technology company.