Title :
High power 14 GHz SSPA for SATCOM applications
Author :
Mallavarpu, R. ; Puri, M.P.
Author_Institution :
Raytheon Co., Waltham, MA, USA
Abstract :
Describes the development of a 14.0-GHz, 30-W FET combiner/amplifier intended as a replacement for 50-W TWTA (traveling-wave-tube amplifier) used in communication-satellite uplink transmitter applications. The output stage of the amplifier consists of four 8-W power FETs that are combined using a 3D combining circuit known as the spatial field power combiner. The entire amplifier is a self-contained unit with its own heat sink and high velocity blower and a regulatory/sequencing circuitry for FET biasing. The amplifier results presented here show a P/sub sat/=30 W-min, P/sub 1dB/=25 W, an AM/PM conversion=2 degrees /dB max, a noise figure of 4 dB, and a typical two-tone IM/sub 3/=25 dBc with single carrier backed off 6 dB from saturation.<>
Keywords :
microwave links; power amplifiers; radio transmitters; satellite links; solid-state microwave circuits; waveguide couplers; 14.0 GHz; 30 W; 3D combining circuit; 4 dB; AM/PM conversion; FET combiner/amplifier; SATCOM applications; blower; communication-satellite uplink transmitter; heat sink; regulatory/sequencing circuitry; single carrier; spatial field power combiner; Bandwidth; Circuits; Cogeneration; FETs; High power amplifiers; Power amplifiers; Power combiners; Radio frequency; Radiofrequency amplifiers; Transmitters;
Conference_Titel :
Microwave Symposium Digest, 1993., IEEE MTT-S International
Conference_Location :
Atlanta, GA, USA
Print_ISBN :
0-7803-1209-0
DOI :
10.1109/MWSYM.1993.277091
