Results 181 to 190 of about 47,623 (225)
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1992 IEEE Microwave Symposium Digest MTT-S, 2003
Quasi-optical array voltage-controlled oscillators (VCOs) are presented. A quasi-optical VCO consists of an array of oscillators, a variable capacitance array, and a mirror. In the oscillator array, a large number of MESFETs feed a two-dimensional periodic metal structure on a dielectric substrate.
S. Bundy, T.B. Mader, Z.B. Popovic
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Quasi-optical array voltage-controlled oscillators (VCOs) are presented. A quasi-optical VCO consists of an array of oscillators, a variable capacitance array, and a mirror. In the oscillator array, a large number of MESFETs feed a two-dimensional periodic metal structure on a dielectric substrate.
S. Bundy, T.B. Mader, Z.B. Popovic
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IEEE Microwave and Wireless Components Letters, 2005
This paper presents current reused voltage controlled oscillator (VCO) topologies by stacking switching transistors in series like a cascode. The VCOs can operate with only half the amount of dc current compared to those of the conventional VCO topologies.
Oh, NJ, Lee, SG Lee, Sang-Gug
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This paper presents current reused voltage controlled oscillator (VCO) topologies by stacking switching transistors in series like a cascode. The VCOs can operate with only half the amount of dc current compared to those of the conventional VCO topologies.
Oh, NJ, Lee, SG Lee, Sang-Gug
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Proceedings of the IEEE 2012 Custom Integrated Circuits Conference, 2012
Phase-locked loop (PLL) frequency synthesizers are critical building blocks for wireless transceivers. Frequency synthesis requires integrated oscillators and dividers that can provide superior phase noise performance at ultra-high frequencies. This session focuses on design of high-performance PLLs and building blocks, including voltage- and current ...
Fa Foster Dai, Howard Luong
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Phase-locked loop (PLL) frequency synthesizers are critical building blocks for wireless transceivers. Frequency synthesis requires integrated oscillators and dividers that can provide superior phase noise performance at ultra-high frequencies. This session focuses on design of high-performance PLLs and building blocks, including voltage- and current ...
Fa Foster Dai, Howard Luong
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Oscillation Mode Swapping Dual-Band VCO
IEEE Microwave and Wireless Components Letters, 2016A switching network exploiting the principle that the resultant phase noise of VCO will be reduced in proportion to 1/ $N$ , if $N$ oscillators are ideally coupled together. The VCO consists of two cross-coupled oscillators joining by a pair of mode-switched inductors.
Jain, S, Jang, S.-L, Tchamov, N.T.
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Nonlinear analysis of quadrature LC–VCOs
2009 European Conference on Circuit Theory and Design, 2009We present a nonlinear approach based on the perturbation theory to analyze the synchronized oscillations in circuits made up of two coupled LC differential oscillators (LC-VCO), widely used in RF systems to generate quadrature oscillations. Closed-form expressions are derived to predict the amplitude and phase of oscillations and their orbital ...
BUONOMO, Antonio, LO SCHIAVO, Alessandro
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Bandwidth-enhanced differential VCO and varactor-coupled quadrature VCO for mmWave applications
AEU - International Journal of Electronics and Communications, 2018Abstract This paper presents a bandwidth-enhanced differential LC-Voltage Controlled Oscillator (LC-VCO) and varactor-coupled Quadrature VCO (QVCO) designed and simulated in high-performance SiGe HBTs of the GlobalFoundries (GFs) 130 nm SiGe BiCMOS8HP process for mmWave applications.
Farman Ullah +4 more
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2018
The phase noise (PN) at the output of the phase locked loop (PLL) sets a fundamental limit to the maximum spectral efficiency that the whole system can achieve. As discussed in Chap. 1, the bit error rate against SNR requirements in an AWGN environment shown in Fig. 1.7 changes drastically when a practical PN profile is considered, see Fig.
Marco Vigilante, Patrick Reynaert
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The phase noise (PN) at the output of the phase locked loop (PLL) sets a fundamental limit to the maximum spectral efficiency that the whole system can achieve. As discussed in Chap. 1, the bit error rate against SNR requirements in an AWGN environment shown in Fig. 1.7 changes drastically when a practical PN profile is considered, see Fig.
Marco Vigilante, Patrick Reynaert
openaire +1 more source
2004
This workshop provides a comprehensive overview of different aspects of oscillator theory, design and practical implementation. Topics include the principles of oscillator design, including start-up and steady-state operation conditions, simplified circuit analysis and basic equations using bipolar and field-effect transistors and the theories required
A. COSTANTINI +2 more
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This workshop provides a comprehensive overview of different aspects of oscillator theory, design and practical implementation. Topics include the principles of oscillator design, including start-up and steady-state operation conditions, simplified circuit analysis and basic equations using bipolar and field-effect transistors and the theories required
A. COSTANTINI +2 more
openaire +1 more source
2003
We have presented some theoretical work in the last chapter for ring oscillator phase noise analysis. In this chapter, we focus on practical design considerations. A ring VCO with differential control and quadrature outputs is taken as a example to demonstrate low phase noise VCO design. This chapter is organized as follows.
Liang Dai, Ramesh Harjani
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We have presented some theoretical work in the last chapter for ring oscillator phase noise analysis. In this chapter, we focus on practical design considerations. A ring VCO with differential control and quadrature outputs is taken as a example to demonstrate low phase noise VCO design. This chapter is organized as follows.
Liang Dai, Ramesh Harjani
openaire +1 more source