AbstPact An on-chip fdter using monolithic transformer that can be integrated on a Si substrate is presented. The new filter topology has been fabricated using Motorola 0.18 micron copper process. Measurement results show significant improvement in Q of the present design compared to the inductor implementation. The size and Q advantages of the new topology can be useful in cost sensitive consumer products.

Radio frequency spectrum is expensive and sophisticated modulation techniques, leading to wide, dynamic signals require linear amplification. The penalty for achieving linearity is efficiency. The challenge is therefore to develop power amplifiers which offer high linearity and high efficiency in the back-off. In this paper, the idea of Modified Doherty Amplifier Ill is extended by using a push-pull class-B amplifier in place of class-AB amplifier and a complementary class-C amplifier in place of single ended class-C amplifier to improve linearity and to provide high efficiency in back-off.Index Terms -power amplifier.