Results 151 to 160 of about 147,442 (200)

A New Quadrature LC-Oscillator

2007 IEEE International Symposium on Circuits and Systems (ISCAS), 2007
A new circuit topology for quadrature signal generation is presented. In the proposed circuit two identical negative-resistance oscillators are coupled to each other via capacitors in such a way that quadrature signals are generated. An analysis of the linearized model of the circuit is presented.
Malihe Zarre Dooghabadi, Sasan Naseh
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Phase noise and accuracy in quadrature oscillators

2004 IEEE International Symposium on Circuits and Systems (IEEE Cat. No.04CH37512), 2004
This paper proposes a complete analysis of quadrature-coupled LC oscillators. These oscillators operate off-resonance and for this reason, their phase noise worsens at increasing coupling strength. Since the coupling transistors raise the total power consumption, the noise-power product degrades further with respect to a stand-alone oscillator.
ROMANO', LUCA, LEVANTINO, SALVATORE, BONFANTI, ANDREA GIOVANNI, SAMORI, CARLO, LACAITA, ANDREA LEONARDO   +4 more
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A quadrature relaxation oscillator-mixer in CMOS

Proceedings of the 2003 International Symposium on Circuits and Systems, 2003. ISCAS '03., 2003
This paper describes the design of a quadrature cross-coupled oscillator circuit integrated which also realizes the mixer function in a phase lock loop (PLL). This should be able to provide a very accurate phase relation (
Luís Bica Oliveira, Jorge R. Fernandes, Michiel H. L. Kouwenhoven, Chris van den Bos, Chris J. M. Verhoeven   +4 more
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A quadrature RC-oscillator with capacitive coupling

Integration, 2016
In this paper the capacitive coupling in quadrature RC-oscillators is investigated. The capacitive coupling has the advantages of being noiseless with a small area penalty and without increasing the power dissipation. The results show that a phase error below 1?
João Casaleiro, Luís B. Oliveira, Igor M. Filanovsky   +2 more
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Quadrature oscillators using CCIIs

International Journal of Electronics, 2005
Three third-order quadrature oscillators are proposed. Outputs of two sinusoids with 90° phase difference are available in each quadrature oscillator circuit. The oscillation condition and oscillation frequency of each proposed quadrature oscillator are orthogonal controllable. All proposed circuits employ only grounded capacitors.
Jiun-Wei Horng *, Chun-Li Hou, Chun-Ming Chang, Wen-Yaw Chung, Han-Wei Tang, Yao-Hsin Wen   +5 more
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On transconductance-C quadrature oscillators

International Journal of Electronics, 1997
Two circuits of Electronically Tunable Quadrature Oscillators (ETQOs) are given, which only use operational transconductance amplifiers (OTAs) and capacitors. In these circuits, a wide range of linear ƒo-tunability is present with bias voltage/current control of the OTAs.
MUSLIM T. AHMED, IQBAL A. KHAN, NIGAR MINHAJ   +2 more
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A quadrature oscillator for LTE/LTE-A standards with an improved quadrature-mode stability

2015 IEEE International Symposium on Circuits and Systems (ISCAS), 2015
This paper introduces a quadrature oscillator for LTE/LTE-A standards with an improved quadrature mode stability using transformers. In Inductor-based (L-based) quadrature voltage controlled oscillators (QVCO), there exist two stable quadrature modes. When a transformer is used in place of an inductor in a QVCO, it is shown that the selected quadrature
Amany El-Gouhary, Nathan M. Neihart
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DDCCTA-based quadrature oscillator

2013 Eleventh International Conference on ICT and Knowledge Engineering, 2013
This paper presents a voltage-mode quadrature oscillator employing a differential difference current conveyor transconductance amplifier and all-grounded passive devices. The use of grounded passive devices makes the proposed circuit ideal for integrated circuit implementation.
Montree Kumngern, Anusorn Auttaput, Kobchai Dejhan   +2 more
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Analysis and Design of Quadrature Oscillators

2008
The following are some features of Analysis and Design of Quadrature Oscillators make it different from the existing literature on electronic oscillators: (1) focus on quadrature oscillators with accurate quadrature and low phase-noise, required by modern communication systems; (2) a detailed comparative study of quadrature LC and RC oscillators ...
Luis B. Oliveira, Jorge R. Fernandes, Igor M. Filanovsky, Chris J.M. Verhoeven, Manuel M. Silva   +4 more
openaire   +1 more source

A Complementary-Coupled CMOS LC Quadrature Oscillator

IEICE Transactions on Electronics, 2008
SUMMARY A novel CMOS LC quadrature oscillator (QO) whichadopts complementary-coupling circuitry has been proposed. The perfor-mance improvement in I/Q phase error and phase noise of the proposedQO, is explained in comparison with conventional QOs. The proposedQO is implemented in 0.18μm CMOS technology along with conventionalQOs. The measurement result
Yun, SJ Yun, Seok-Ju, Yoon, DY Yoon, Dae-Young, Lee, SG Lee, Sang-Gug   +2 more
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