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This paper reports on a Voltage-Controlled-Oscillator (VCO) chip set covering 7–13 GHz with phase noise better than −125 dBc/Hz at 1 MHz off-set. The chip set is implemented in GaN HEMT MMIC technology and designed for use in satellite transponders. 6 VCOs are used to cover the full range, each of them has tuning range about 1 GHz with output power in the order of 5 dBm. GaN HEMT technology is chosen...
X-Band AlGaN/GaN HEMT power MMIC on Sl-SiC designed in microstrip technology is presented in this paper. Recessed-gate and field-plate are used in the device process to improve the AlGaN/GaN HEMTs performances. S-parameter measurements show a strong dependence of the frequency performances of the AlGaN/GaN HEMTs on the operating voltage. Higher operating voltage is key to get higher power gain for...
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