Overlapped inductors and its application on a shared RF front-end in a MultiStandard IC

A technique to build overlapped inductors at the same location while keeping good isolation between them is presented. The key idea is to use magnetic and electric cancellation to reduce coupling. A shared LNA for WiFi and Bluetooth (BT) applications using the overlapped inductor is proposed. It enables independent gain control up to the first RF stage in a receiver so that the system integration complexity is reduced.