Broadcom said today it has agreed to buy NetLogic Microsystems for $3.7 billion as part of a move to consolidate its presence in the communications chip market.

The deal shows that the communications chip market is still a high stakes battle, as Broadcom tries to fight with a variety of rivals from Intel to Qualcomm.

Under the deal, Santa Clara, Calif.-based NetLogic shareholders will get $50 per share. Irvine, Calif.-based Broadcom will pick up new product lines such as knowledge-based processors, multi-core embedded processors, and digital front-end processors.

The deal has been approved by the boards of both companies and is expected to close in the first half of 2012, subject to the usual closing conditions.

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NetLogic’s share price was $31.91 on Friday, so the deal is a significant premium above the current valuation. NetLogic’s shares are up more than 50 percent this morning. Broadcom said the deal will add 10 cents a share to non-GAAP earnings in 2012, and Broadcom reaffirmed its revenue target for the third quarter at $1.9 billion to $2 billion.

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