(Reuters) - Chinese cellphone chip designer Spreadtrum Communications Inc will be acquired by a unit of government-owned Tsinghua Holdings Co Ltd for a raised offer price of about $1.78 billion. Tsinghua Unigroup will pay $31 for each Spreadtrum American Depositary Share (ADS), up from its previous offer of $28.50 per ADS, the companies said on Friday. The offer represents a premium of 17 percent to Spreadtrum's Thursday closing price on the Nasdaq. Spreadtrum shares were up 12.5 percent at $29.75 in premarket trading on Friday. ...

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