8 research outputs found
InGaP Power HBTs : Basic power cells for High Power transistors
Power HBT Technology offers today the best compromise for high power – high efficiency amplifiers up to Ku band. Many improvements have been published in the past to offer a better behaviour in terms of thermal heating and microwave performances. Since the reliability limiting factors have been solved, significant improvements could be proposed to get more power. In this paper, we report on the proposal of new elementary cells used in multi-finger transistors. Based on these, compact very high power amplifiers could be considered
Power Performance Evaluation of AlGaN/GaN HEMTs through Load Pull and Pulsed I-V Measurements
A systematic evaluation of power
performances of AlGaN/GaN HEMTs has been performed
by means of CW on wafer Load Pull measurements at X
band. Those measurements have been correlated to the
results obtained through I-V and S-parameters pulsed
measurements and a strong correlation has been found
between the two types of measurement. Power up to 6Watts
has been measured on a 1.2 mm device that can be further
improved if trapping effects can be removed. A non linear
electrical model of the 0.25x 1200 µm² transistor taken from
the I-V and the S-parameters pulsed measurements is
validated by CW load pull measures
Influence of passivation on High-Power AlGaN/GaN HEMT devices at 10GHz.
AlGaN/GaN high electron mobility
transistors (HEMTS on SiC) were characterized before and
after SiO2/Si3N4 passivation. DC, small signal, pulsed and
large signal measurements were performed. We discuss the
role and the influence of passivation on the device
performance and characteristics. A good correlation is
observed between pulsed and power measurements. At
10GHz, a 6.3W/mm power density with a 36% PAE at 2dB
of compression was obtained after passivation, while only
2.9W/mm before passivation