Sorting out the amp in a mobile phone Two MIT researchers claimed that they have doubled the life of a mobile phone battery by tweaking an efficiency problem related to the power amplifier. The professors Joel Dawson and David Perreault claim that power amplifiers are to blame for much of the draining of a mobile phone and the amp chips waste as much as 65 per cent of their energy. They have formed a startup called Eta Devices which will flog gear that they claim to have solved this problem. The technology is currently being tested in labs. They think...