Revista: MICROWAVE AND OPTICAL TECHNOLOGY LETTERS. Vol. 50. No.11. Pp.2967-2970. 2008

Autores: J. GRAJAL, F. CALLE, J. PEDRÓS, J. L. MARTÍNEZ-CHACÓN, A. JIMÉNEZ

Surface acoustic wave filters fabricated on AlGaN/GaN heterostructures allow the control of their insertion losses through external voltages applied to the interdigital transducers. A novel SAW delay-line oscillator based on an AlGaN/GaN-on-sapphire SAW device with an oscillation frequency of 475 MHz has been developed. Its waveform compression is controlled by varying the insertion losses of the active SAW filter. A small temperature coefficient of delay of 17.5 ppm/°C has been obtained.