Abstract
AbstractThe utilization of Ku‐band satellite broadcasting and satellite communication is progressing. A high stability of oscillation frequency is required for local oscillators of receiver converters used in such communication. Therefore, analytical and experimental examinations have been carried out for the oscillation principle and the stabilizing method for oscillators using a common drain GaAs FET without an external feedback circuit and a very high‐Q dielectric oscillator.First, the output admittance of the common drain FET oscillator is calculated using GaAs FET small‐signal parameters to clarify the oscillation principle. Next, the oscillation frequency characteristics are analyzed and it has been shown that it is necessary to reduce the variation of oscillator output susceptance with the applied voltage to stabilize the oscillation frequency. The addition of a capacitive admittance to the oscillator source output is effective for this purpose.In an oscillator with a 0.02 S capacitive stub formed at the source output, oscillation frequency of 10.678 GHz, temperature variation of less than 600 kHz (‐20°C ∼ +60°C), and phase noise of ‐95 dBc/Hz (offset frequency: °10 kHz) have been obtained.
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