طراحی و ساخت نوسانساز کم نویز با استفاده از ساختار مشدد دی الکتریک فعال

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه شهید بهشتی

چکیده

 در این مقاله، تئوری طراحی یک نوسانساز با مشدد دی الکتریک فعال در فرکانس GHz8 با ساختاری جدید نشان داده شده است. این ساختار تکیه بر کاهش نویز فاز به وسیله تنها یک عنصر فعال دارد در حالی که در ساختارهای پیشنهادی قبلی از دو عنصر فعال استفاده می شده است. ساختار پیشنهاد شده از یک فیدبک اضافی بین تقویت کننده و مشدد به منظور افزایش ضریب کیفیت بهره می برد. نتایج اندازه گیری نشان می دهد که نویز فاز به مقدار dBc/Hz 145- در آفست kHz 100 کاهش پیدا کرده که بیانگر dB12 بهبود در مقایسه با نوسانساز با مشدد دی الکتریک غیر فعال می باشد.  هم چنین، در مقایسه با نوسانسازهایی با مشددهای فعال معمول، منبع نویز تقویت کننده دوم که موجب نوسان های ناخواسته می شود، حذف گردیده و هم چنین سایز و توان مصرفی کاهش یافته است. این ساختار دارای پائین ترین مقدار نویز فاز در مقایسه با نوسانساز با مشددهای دی الکتریک دیگر می باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Design and Fabrication of Low Noise Oscillator Using Active Dielectric Resonator

نویسندگان [English]

  • zahra Soltani
  • Shahrooz Asadi
  • Esfandiar Mehrshahii
Shahid Beheshti University
چکیده [English]

In this paper, the design theory of an 8 GHz oscillator based on a new structure of active dielectric resonators is presented. The new structure emphasizes on phase noise reduction by employing 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 to oscillators with passive dielectric resonators. Also, compared to oscillators with conventional active resonators, noise source of the second amplifier which makes spurious oscillation is removed. The size and power consumption are reduced since one transistor is used in the presented structure. This structure performs the lowest phase noise compared to oscillators with other dielectric resonators.

کلیدواژه‌ها [English]

  • Active Feedback
  • Dielectric Resonator Oscillator
  • Phase Noise
  • Quality Factor
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