Mobileburn:

According to the filing, Google increased its bid for Motorola by 33 percent in one day, bringing the purchase price up by $3 billion. This was without Motorola entertaining bids from other companies. The filing also says that Google first initiated talks with Motorola in July with regards to patent issues facing Android, and those talks quickly escalated to a plan to acquire the company.

Google didn’t want to mess around – it wanted Motorola Mobility and its patents, and was willing to do whatever it took to seal the deal quickly.