High-temperature superconducting resonator-stabilized coplanarhybrid-integrated oscillator at 6.5 GHz

摘要

A small-size coplanar oscillator has been designed and entirelyfabricated on a 10-mm×10-mm2 LaAlO₃substrate in superconducting microwave integrated circuit (SMIC)technology. As an active element, a GaAs MESFET has been used. Theoscillator is stabilized by a coplanar waveguide transmission lineresonator patterned from a YBa₂Cu₃O_7-xfilm onto the LaAlO₃ substrate. The oscillator, operating at77 K, is characterized by a center frequency of 6.5 GHz and a poweroutput of nearly 5 dBm. A single-sideband phase noise to carrier ratioof -90 dBc/Hz at 10-kHz offset has been attained. The attenuation ofharmonics is better than 10 dBc