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Optically modulated III–V nitride-based high-power IMPact Avalanche Transit Time oscillator at Millimeter-wave window frequency

Published online by Cambridge University Press:  19 January 2010

Moumita Mukherjee  and
Sitesh Kumar Roy
Moumita Mukherjee*
Affiliation:
Centre of Millimeter-Wave Semiconductor Devices and Systems (Cmsds, A Joint Venture Between Drdo, Ministry Of Defence, Govt. of India and University of Calcutta), Centre of Advanced Study in Radiophysics and Electronics, University of Calcutta 1, Girish Vidyaratna Lane, Kolkata 700009, West Bengal, India.
Sitesh Kumar Roy
Affiliation:
Centre of Millimeter-Wave Semiconductor Devices and Systems (Cmsds, A Joint Venture Between Drdo, Ministry Of Defence, Govt. of India and University of Calcutta), Centre of Advanced Study in Radiophysics and Electronics, University of Calcutta 1, Girish Vidyaratna Lane, Kolkata 700009, West Bengal, India.
*
Corresponding author: M. Mukherjee Emails: [email protected], [email protected]
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Abstract

Extensive simulation experiments are carried out for the first time, to study the optical modulation of the high- frequency characteristics of III–V GaN-(gallium nitride) based top-mounted and flip-chip IMPact Avalanche Transit Time (IMPATT) oscillators at MM-wave window frequency (140.0 GHz). It is found that the un-illuminated GaN IMPATT is capable of delivering a RF power of 5.6 W with an efficiency of 23.5% at 145.0 GHz. Frequency up-chirping of 6.0 GHz and a degradation of RF power output by almost 15.0% are further observed in case of photo-illuminated FC IMPATT. The study reveals that compared to predominate electron photocurrent in top-mounted IMPATT, photo-generated leakage current dominated by hole in flip-chip IMPATT has more pronounced effect on the GaN-based device as regards the frequency chirping and decrease of negative conductance and total negative resistance per unit area of the device. The inequality in the magnitudes of electron and hole ionization rates in the wide band gap semiconductor has been found to be correlated with the above results. The study reveals that GaN IMPATT is a potential candidate for replacing conventional IMPATTs at high-frequency operation. These results are useful for practical realization of optically controlled GaN-based high-power IMPATTs for application in MM-wave communication systems.

Keywords

III–V GaNFlip-chip diodeTop-mounted diodeIMPATT oscillatorPhoto-illuminationOptical modulationMM-wave window frequencyCarrier ionization coefficient
Type
Original Article
Information
International Journal of Microwave and Wireless Technologies , Volume 1 , Issue 5 , October 2009 , pp. 423 - 429
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2010

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