GLTRS--Glenn
TITLE AND SUBTITLE:
A Cryogenic GaAs PHEMT/Ferroelectric Ku-Band Tunable Oscillator

AUTHOR(S):
Robert R. Romanofsky, Fred W. Van Keuls, and Felix A. Miranda

REPORT DATE:
April 1998

FUNDING NUMBERS:
WU-632-50-5D-00

PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Lewis Research Center
Cleveland, Ohio 44135-3191

PERFORMING ORGANIZATION REPORT NUMBER:
E-11113

SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Washington, DC 20546-0001

REPORT TYPE AND DATES COVERED:
Technical Memorandum

SPONSORING/MONITORING AGENCY REPORT NUMBER:
NASA TM-1998-206967

SUPPLEMENTARY NOTES:
Prepared for the 3rd European Workshop on Low Temperature Electronics sponsored by the Dipartimento di Fisica, Universita' degli Sturh di Milan and IEEE Electron Devices Society, San Miniato, Tuscany, Italy, June 24-26, 1998.
Robert R. Romanofsky and Felix A. Miranda, NASA Lewis Research Center; Fred W. Van Keuls, National Research Council-NASA Research Associate at Lewis Research Center. Responsible person, Robert R. Romanofsky, organization code 5640, (216) 433-3507.

ABSTRACT:
A Ku-band tunable oscillator operated at and below 77 K is described. The oscillator is based on two separate technologies: a 0.25 mm GaAs pseudomorphic high electron mobility transistor (PHEMT) circuit optimized for cryogenic operation, and a gold microstrip ring resonator patterned on a thin ferroelectric (SrTiO3) film which was laser ablated onto a LaAlO3 substrate. A tuning range of up to 3% of the center frequency was achieved by applying dc bias between the ring resonator and ground plane. To the best of our knowledge, this is the first tunable oscillator based on a thin film ferroelectric structure demonstrated in the microwave frequency range. The design methodology of the oscillator and the performance characteristics of the tunable resonator are described.

SUBJECT TERMS:
Resonators; Microwave oscillators; Voltage controlled oscillator

NUMBER OF PAGES:
11

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