Design Of the High Performance VCO At 1GHz Frequency
Publish place: کنفرانس بین المللی مهندسی و فن آوری اطلاعات
Publish Year: 1396
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
ICET01_041
تاریخ نمایه سازی: 13 شهریور 1396
Abstract:
Oscillators are circuits that requires no input signal, produced of output signal. These circuits in the signal generation sources, used In various applications such as, communication circuits, digital systems and controls, watches, computers, medical equipment, etc. in order to provide frequency that determine accuracy time. In many application circuit, oscillator used should be adjustable, the output frequency is a function of an input signal (usually a voltage). This type of oscillator Called voltage controlled oscillator (vco).In this paper represents a new enhanced Colpitts oscillator, which is designed based on gm-boosting of a conventional Colpitts oscillator. The proposed topology increases the negative resistant and enhances the startup difficulty of the conventional Colpitts oscillator. This enables the Colpitts oscillator to operate in low-power consumption. The proposed circuit is designed using 0.18 μm technology and is simulated under 1.8V supply voltage the operating frequency is 1 GHz in software advanced design system (ADS). Simulations show the output phase noise of -135.8 dBc/Hz at 1MHz offset frequency when the operating frequency is 1 GHz
Keywords:
Colpitts oscillator , gm-boosting , voltage controlled oscillator (vco) , oscillation frequency , phase noise
Authors
Mojtaba Sadeghi
Department of Electrical Engineering, Shiraz Branch,Islamic Azad University ,Shiraz, Iran
Abbas Kamali
Department of Electrical Engineering, Fasa Branch,Islamic Azad University ,Fasa, Iran
Seyed Mohammad Sadegh Hashemi Nassab
Ph.D student of Islamic Azad University Fasa, Iran