A New Low-Noise Dual-Band VCO for WLAN/WIMAX
| Autor: | Bahare Ghasemi-Rostam, Hossein Miar-Naimi |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Engineering
Oscillation business.industry Applied Mathematics 020208 electrical & electronic engineering 020206 networking & telecommunications 02 engineering and technology Voltage-controlled oscillator Amplitude Quality (physics) CMOS Control theory Signal Processing Phase noise 0202 electrical engineering electronic engineering information engineering Multi-band device Transient (oscillation) business |
| Zdroj: | Circuits, Systems, and Signal Processing. 35:4153-4169 |
| ISSN: | 1531-5878 0278-081X |
| DOI: | 10.1007/s00034-016-0260-4 |
| Popis: | In this paper, a new dual-band voltage-controlled oscillator (VCO) is proposed. The proposed VCO utilizes a fourth-order LC resonator that oscillates at two different frequencies. Moreover, its oscillation frequency can be chosen by switching the tail current between two different values. The switches are placed in a way that their resistances do not affect the quality factor of LC tanks, and phase noise does not increase. The proposed VCO is thoroughly analyzed by deriving a nonlinear model. The required conditions for oscillation and switching between two oscillation frequency bands are calculated approximately using averaging. Moreover, the VCO transient behavior in switching the oscillation frequency is investigated, and amplitudes of oscillation at two oscillation modes are calculated. The VCO is designed and simulated in $$0.18\,\upmu \hbox {m}$$0.18μm CMOS technology to verify the design and analytical equations and to evaluate the performance of the proposed VCO. In comparison with the literature, proposed simulations show acceptable phase noise and transient behavior. In addition, the accuracy of the analytical equations is also verified. |
| Databáze: | OpenAIRE |
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