Abstract :
Ceramic coaxial and SAW (surface acoustic wave) resonators are renowned for their ability to generate high spectral purity signal at RF and microwave frequency. However, ceramic and SAW resonator based signal sources (oscillators) are costly and not suited for fabrication by current integrated circuit (IC) technology due to their 3D (three-dimensional) structure. Nor are they immune to electromagnetic interference (EMI), vibration effects, microphonics, phase hits, and frequency modulation. This paper describes mode-coupled stubs-tuned planar resonators that offer user-definable, cost-effective, phase hits insensitive, integrable, compact, and low cost spectral pure signal source for present and later generation wireless communication systems. The measured phase noise for a carrier frequency 2488 MHz is better than -125 dBc/Hz at 10 kHz offset, and to our knowledge, this is the best phase noise performance for this class of VCO (voltage controlled oscillator) using MCSTPR (mode-coupled stubs-tuned planar resonator) so far reported. The reported topology is not limited to this frequency, can be extended for other higher frequency, and well suited for fabrication by current integrated circuit (IC) technology.
Keywords :
integrated circuit technology; microwave integrated circuits; microwave oscillators; phase noise; resonators; voltage-controlled oscillators; SAW resonator; VCO; ceramic coaxial resonators; frequency 2488 MHz; integrated circuit technology; microwave frequency; mode-coupled stubs-tuned planar resonator; noise cancellation technique; phase noise performance; spectral pure signal sources; surface acoustic wave resonators; voltage controlled oscillator; wireless communication systems; Ceramics; Electromagnetic interference; Fabrication; Frequency; Integrated circuit technology; Phase noise; Signal generators; Surface acoustic waves; Voltage-controlled oscillators; Wireless communication; 3-D; EMI; IC; MCSTPR; RF; SAW; VCO;
