Imagination and Ceva have been battling to buy the operating business of MIPS since last month when a $60 million agreed offer from the British company triggered a bidding war.
Imagination's $100 million offer trumps a $90 million bid from Ceva last week.
MIPS was a pioneer of 32-bit and 64-bit processing, and its technology is in blu-ray players, digital televisions and video games consoles such as the Sony PlayStation 2.
The California-based company agreed to sell 498 patents for $350 million to a consortium of technology companies organized by patent holding company Allied Security Trust and led by ARM when it agreed the initial Imagination deal.
(Reporting by Paul Sandle; editing by James Davey)
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