AN HEMT WITH AN INTEGRATED ON-DRAIN CAPACITOR AS BASIS OF AN HYBRID MIXER

This paper reports the study of an HEMT, the characteristic of which i s to have a decoupling capacitor directly integrated between its drain and source electrodes. It is shown that, with an appropriate design o f this basic filtering element, such a device proves to be efficient a s for the realization of hybrid gate mixers. An experimental demonstra tion of this property is given by the comparing a HEMT without capacit or with a HEMT with an integrated capacitor. For the latter, the gate length of which is 0.3 mu m, it is shown that, at 18 GHz, a 5-dB impro vement of conversion gain is provided by the integrated capacitor.