A small chip size 2 W, 62% efficient HBT MMIC for 3 V PCN applications

This work describes the L-band low voltage (/spl ges/1.6 V) power performance of AlGAs/GaAs heterojunction bipolar transistors (HBTs), their modeling and the design of a 2-W monolithic microwave integrated circuit (MMIC) for 3-V wireless mobile PCN applications (1800 MHz). The two-stage MMIC achieves 62% power-added efficiency (PAE) and 33 dB of linear gain, at a very small chip size of 1.2 mm/sup 2/. To our knowledge this is the best combination of power performance data for wireless applications demonstrated so far for a MMIC. The chip size is about a factor of four smaller than comparable MMIC's known before. The MMIC offers the potential both for low cost production due to small chip size, single voltage supply, and high performance at the same time.