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Single transistor low phase noise active dielectric resonator oscillator

Published online by Cambridge University Press:  08 August 2019

Zahra Soltani ,
Shahrooz Asadi Open the ORCID record for Shahrooz Asadi [Opens in a new window]  and
Esfandiar Mehrshahi
Zahra Soltani
Affiliation:
Electrical Engineering Department, Shahid Beheshti University, Tehran, Iran
Shahrooz Asadi*
Affiliation:
Electrical Engineering Department, Shahid Beheshti University, Tehran, Iran
Esfandiar Mehrshahi
Affiliation:
Electrical Engineering Department, Shahid Beheshti University, Tehran, Iran
*
Author for correspondence: Shahrooz Asadi, E-mail: Sh_asadi@sbu.ac.ir
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Abstract

In this paper, the design theory of an 8 GHz oscillator with a new structure of active dielectric resonator (DR) is presented. The new structure emphasizes on phase noise reduction by using only one active device. The proposed structure uses additional feedback from transistor to resonator in order to increase the quality factor. Measurement results report that phase noise is reduced to −145.19 dBc/Hz at 100 kHz offset frequency which represents 12 dB improvement compared with oscillators with passive DR. Also, in comparison with conventional active resonator oscillators, noise source of the second amplifier which makes spurious oscillation is removed. The size and power consumption are reduced due to the use of a single transistor. This structure has the lowest phase noise in comparison with other DR oscillators. In order to implement the proposed oscillator, a circuit including amplifier, resonator, coupler, and phase shifter is designed and realized.

Keywords

Active feedbackdielectric resonator oscillatorphase noisequality factor
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 11 , Issue 10 , December 2019 , pp. 1000 - 1009
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2019 

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