Patent Number: 6,297,700

Title: RF power transistor having cascaded cells with phase matching between cells

Abstract: The power delivered by an RF power transistor having cascaded cells or unitelements is improved by reducing the phase imbalance between elements andthereby reducing transverse effects between cells. Phase imbalance isreduced by varying the number of transistor elements connected tointerconnect areas, connecting wire bonds to an input transmission lineconcentrated near an outer edge in the transmission line to take advantageof surface skin effects on current, and varying the surface area of theinterconnect areas to adjust input impedance and output impedance of eachcell.

Inventors: Sevic; John F. (Los Gatos, CA), Knorr; Christopher J. (Los Gatos, CA), Parker; James R. (Cupertino, CA), Bartlow; Howard D. (Palo Alto, CA)


International Classification:

Expiration Date: 10/02/2013