Feeding structures for packaged multifinger power transistors

Power transistors consist of a large number of cells, which are fed by a long row of parallel bonding wires. All cells are to be operated synchronously in order to avoid output power degradation. When increasing the number of unit cells or the frequency this condition becomes more and more critical. This paper investigates the underlying effects and presents improvements of such feeding structures in the frequency range up to 10 GHz.