A Triple-Tuned Ultra-Wideband VCO

We have already proposed a triple-tuned voltage-controlled oscillator (VCO) for achieving an ultra-wideband characteristic. The triple-tuned VCO consists of an active device and three tuned circuits. The fabricated VCO has achieved the oscillation bandwidth of 5.6-16.8 GHz and the phase noise of -11...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2008-02, Vol.56 (2), p.346-354
Main Authors: Tsuru, M., Kawakami, K., Tajima, K., Miyamoto, K., Nakane, M., Itoh, K., Miyazaki, M., Isota, Y.
Format: Article
Language:English
Subjects:
Applied sciences
Bandwidth
Broadband communication
Circuit optimization
Circuit properties
Circuits
Design. Technologies. Operation analysis. Testing
Devices
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Emittance
Equivalent circuits
Exact sciences and technology
flip-chip devices
Heterojunction bipolar transistors
Integrated circuits
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Microwave devices
Microwave oscillators
Microwaves
Noise levels
Oscillations
Oscillators, resonators, synthetizers
radar applications
RLC circuits
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Simulation
Tunable circuits and devices
Ultra wideband technology
varactors
Voltage-controlled oscillators
voltage-controlled oscillators (VCOs)
Wideband
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Summary:We have already proposed a triple-tuned voltage-controlled oscillator (VCO) for achieving an ultra-wideband characteristic. The triple-tuned VCO consists of an active device and three tuned circuits. The fabricated VCO has achieved the oscillation bandwidth of 5.6-16.8 GHz and the phase noise of -114.9 dBc/Hz +/-2.9 dB at 1-MHz offset from the carrier. In this paper, for the first time, the conditions that the VCO achieves the ultra-wideband characteristic are clarified by formulation and simulation. It is also clarified that a transistor of the larger emitter size is suitable for the wideband VCO. In addition, the performances of the proposed VCO are compared with other reported wideband VCOs. As a result, it is shown that the proposed VCO has achieved the lowest figure of merit in the C-Ku-band.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2007.913377