Title :
1 Watt, 65% PAE K-band AlGaAs/GaAs heterojunction bipolar transistors using emitter air-bridge technology
Author :
Hin-Fai Chau ; Hill, D. ; Yarborough, R. ; Tae Kim
Author_Institution :
Texas Instrum. Inc., Dallas, TX, USA
Abstract :
We report on the state-of-the-art power performance of K-band AlGaAs/GaAs heterojunction bipolar transistors (HBTs) which had emitter air-bridges to connect individual emitter fingers within the unit cells to reduce the emitter inductance and device thermal impedance. A 8/spl times/(1.6/spl times/30) /spl mu/m/sup 2/ HBT achieved 1.04 W CW output power and 65.7% power-added efficiency with 6.3 dB associated gain at 20 GHz. The maximum power-added efficiency measured was 67.5% at an output power level of 0.93 W.
Keywords :
III-V semiconductors; aluminium compounds; gallium arsenide; heterojunction bipolar transistors; inductance; microwave bipolar transistors; microwave power transistors; power bipolar transistors; 0.93 to 1.04 W; 20 GHz; 65.7 to 67.5 percent; AlGaAs-GaAs; AlGaAs/GaAs HBTs; K-band; device thermal impedance reduction; emitter air-bridge technology; emitter inductance reduction; heterojunction bipolar transistors; power performance; Fingers; Gallium arsenide; Heterojunction bipolar transistors; Impedance; Inductance; K-band; PHEMTs; Passivation; Power generation; Voltage;
Conference_Titel :
Radio Frequency Integrated Circuits (RFIC) Symposium, 1997., IEEE
Conference_Location :
Denver, CO, USA
Print_ISBN :
0-7803-4063-9
DOI :
10.1109/RFIC.1997.598790
