Designing a Voltage-Controlled Oscillator Capable of Creating Two Separate Frequency Bands Using Microstrip Technology

Fatemeh Shiri ¹ ( Department of Electrical and Computer Engineering- Science and Research Branch, Islamic Azad University, Tehran, Iran )
Massoud Dousti ² ( Department of Electrical and Computer Engineering- Science and Research Branch, Islamic Azad University, Tehran, Iran )
Farzin Shama ³ ( Department of Electrical Engineering- Kermanshah Branch, Islamic Azad University, Kermanshah, Iran )

Submited date : 2023-04-24 Accepted date : 2023-08-10

Keywords: voltage-controlled oscillator, phase noise, dual-band bandpass filter, Monte Carlo analysis, T-shaped resonator,

Abstract :

In this paper, a microstrip dual-band bandpass filter (DB-BPF) is used to design a low phase-noise oscillator. The designed oscillator is fabricated and tested. This filter, which can stabilize frequency, is then implemented in the feedback loop of the low phase-noise oscillator. The phase noise can be largely reduced since the frequency of oscillation is designed at group delay of the edge of the passband. Moreover, the designed oscillator can be restructured to a voltage-controlled oscillator (VCO) when a varactor is connected to a T-shaped resonator of the BPF. The center frequencies of 1.95 and 5.45 GHz are obtained for this oscillator. At the center frequency of 1.95 GHz, a phase noise of -177.1 dBc/Hz is measured at 1 MHz offset. The exact application of these frequency bands is in UMTS and WiMAX radio networks. Additionally, the frequency of the designed VCO can be tuned in the range of 1.84-2.05 GHz within which the measured phase noise at 1 MHz offset increases from -122 to -146.5 dBc/Hz. In this article, Monte Carlo analysis has also been done, and with a tolerance of 5% of all stubs, we have reached a definitive answer with a probability of more than 84%. 

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