Title :
A very high-Q-feedback oscillator at 33 GHz using MMMIC-amplifiers
Author_Institution :
DASA Ulm, Germany
Abstract :
A high-Q circular waveguide cavity is used in a feedback configuration consisting of a low noise amplifier (LNA), a medium power amplifier (MPA) in series and a phase shifter and bandpass filter to select the right resonant mode. Output power is about 6 mW. Short term stability is -130 dBe at 10 kHz offset frequency with 20 dB/following decades. Temperature stability is 40 kHz/centigrade. The center frequency is strongly dependent on the resonant frequency of the resonator, in this case it was adjusted to 32.4 GHz. The phase stability is easy to adjust while monitoring the loop by a special coupling configuration.
Keywords :
MIMIC; MMIC amplifiers; circular waveguides; feedback oscillators; frequency stability; millimetre wave oscillators; 33 GHz; 6 mW; MMMIC-amplifiers; bandpass filter; circular waveguide cavity; coupling configuration; high-Q-feedback oscillator; low noise amplifier; medium power amplifier; offset frequency; output power; phase shifter; phase stability; resonant frequency; resonant mode; short term stability; temperature stability; Band pass filters; Feedback; Frequency; High power amplifiers; Low-noise amplifiers; Oscillators; Phase noise; Phase shifters; Resonance; Stability;
Conference_Titel :
Microwave Symposium Digest. 2000 IEEE MTT-S International
Conference_Location :
Boston, MA, USA
Print_ISBN :
0-7803-5687-X
DOI :
10.1109/MWSYM.2000.863577
