5-GHz Band Highly Linear VCO IC with a Novel Resonant Circuit

Kurachi, Sumiko; Yoshimasu, Toshihiko; Yonemura, Koji

doi:10.1109/smic.2007.322814

Cited by 24 publications

(7 citation statements)

References 5 publications

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“…8a, the two commercial semiconductor based VCO have convex f-V responses. It is assumed that the MOS varactors used in those products have severely concave C-V responses [19,20]. Consequently, to achieve linear frequency tuning, those two VCOs must inevitably be connected to other extra circuits referred in the introduction section [4][5][6].…”

Section: Measurements and Analysismentioning

confidence: 99%

Linear frequency tuning in an LC-resonant system using a C–V response controllable MEMS varactor

Han

Yoon

et al. 2017

Micro and Nano Syst Lett

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This paper proposes a device level solution to achieve linear frequency tuning with respect to a tuning voltage (V tune ) sweep in an inductor (L)-capacitor (C) resonant system. Since the linearity of the resonant frequency vs. tuning voltage (f-V) relationship in an LC-resonant system is closely related to the C-V response characteristic of the varactor, we propose a C-V response tunable varactor to realize the linear frequency tuning. The proposed varactor was fabricated using microelectromechanical system (MEMS) surface micromachining. The fabricated MEMS varactor has the ability to dynamically change the C-V response characteristic according to a curve control voltage (V curve-control ). When V curvecontrol was increased from zero to 9 V, the C-V response curve was changed from a linear to a concave form (i.e., the capacitance decreased quickly in the low tuning voltage region and slowly in the high tuning voltage region). This change in the C-V response characteristic resulted in a change in the f-V relationship, and we successfully demonstrated almost perfectly linear frequency tuning in the LC-resonant system, with a linearity factor of 99.95%.

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Section: Measurements and Analysismentioning

confidence: 99%

Linear frequency tuning in an LC-resonant system using a C–V response controllable MEMS varactor

Han

Yoon

et al. 2017

Micro and Nano Syst Lett

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“…Nonlinearity of K VCO degraded the stability and limited the performance of PLL. Therefore, there is a demand for the improvement of linearity of the LC tank . In the linear‐tuning oscillator structure, there are many ways to implement by switching capacitor array , parallel resonator , series capacitor bank , and distributed varactor biasing .…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, there is a demand for the improvement of linearity of the LC tank . In the linear‐tuning oscillator structure, there are many ways to implement by switching capacitor array , parallel resonator , series capacitor bank , and distributed varactor biasing . In the above references, the circuits operated in the low power consumption which reduced phase noise and increased tuning range could be mutually trade‐off.…”

Section: Introductionmentioning

confidence: 99%

Design of 5‐GHz CMOS LC VCO with dual tuning circuit

Hsu

Hung

2014

Micro & Optical Tech Letters

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In this article, a linear tuning range, low power, and low phase noise of CMOS voltage controlled oscillator (VCO) is presented. The core circuit of VCO is adopted dual‐tuning LC resonator with two transformer coupling structure. The bandwidth of the frequency range is from 4.85 to 5.84 GHz with a 18.5% tuning ratio by two tuning voltages. The phase noise of the proposed VCO is −119.3 dBc/Hz at 1 MHz offset frequency. The power consumption is 5.2 mW from 1 V supply and the KVCO exhibits the linearity with 240 MHz/V. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1356–1360, 2014

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“…16 18 LC oscillator dampens and decays after an impulse signal is applied to it [35]. 16 19 Negative resistance. .…”

Section: Oscillators and Barkhausenmentioning

confidence: 99%

“…There have been other techniques proposed in literature to linearize the frequency response of oscillators; such as using weighted banks from [15] and [16] (shown in Figure 15), or controlling the potential of the IC (integrated circuit) substrate to correct linearity from [17].…”

Section: Other Literature In Linearizing Frequency Response Of Oscillmentioning

confidence: 99%

Design of a Linear LC Digitally Controlled Oscillator Using Topographical Field Maps

Abdullah¹

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5-GHz Band Highly Linear VCO IC with a Novel Resonant Circuit

Cited by 24 publications

References 5 publications

Linear frequency tuning in an LC-resonant system using a C–V response controllable MEMS varactor

Linear frequency tuning in an LC-resonant system using a C–V response controllable MEMS varactor

Design of 5‐GHz CMOS LC VCO with dual tuning circuit

Design of a Linear LC Digitally Controlled Oscillator Using Topographical Field Maps

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