Passive FET MMIC linearizers for C, X and Ku-band satellite-applications

Abstract

The design and measured performance of GaAs monolithic-microwave-integrated circuit (MMIC) linearizers for use with spaceborne traveling-wave-tube amplifiers (TWTAs) are presented. The linearizers operate at C-, X- and Ku-band and are believed the first to be realized in MMIC form. They are based on a passive FET design similar to that of MMIC switches and attenuators. MESFET varactors and voltage variable resistors are used as control elements. They provide more than 2.5 GHz of bandwidth at Ku-band with an improvement of greater than 10 dB in TWTA carrier-to-intermodulation ratio (C/I), and with a phase change of less than 5 degrees .<>