Results 161 to 170 of about 147,442 (200)
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CMOS digitally programmable quadrature oscillators
International Journal of Circuit Theory and Applications, 2008AbstractCMOS digitally programmable quadrature oscillators based on digitally controlled current followers and voltage followers are proposed. The proposed designs provide the advantage of programmability similar to the operational transconductance amplifier‐based oscillators while offering improved linearity.
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A 5.8-GHz Quadrature Cross-Coupled Oscillator
Analog Integrated Circuits and Signal Processing, 2003This paper describes an implementation of a quadrature cross-coupled relaxation oscillator to be used in an OFDM RF frontend transceiver. A prototype of the oscillator was realized in a Si-Ge BiCMOS technology, and an oscillator frequency of 5.8 GHz was obtained, which is 1/6 of the maximum f/sub T/ of the bipolar transistors.
J.R. Fernandes +4 more
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Quadrature Delay-Locked Oscillator
CLEO 2025A voltage-controlled oscillator (VCO) is stabilized using optical delay lines, improving the VCO temperature stability by more than a factor of three. A four-tap delay line provides quadrature optical signals suitable for on-chip clocking applications.
Henry Love, Firooz Aflatouni
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A low-voltage quadrature log-domain oscillator
9th International Conference on Electronics, Circuits and Systems, 2003A new quadrature oscillator is proposed in bipolar technology. It exploits the exponential nature of bipolar transistors and thus it is suitable for low distortion operation at low supply voltage. The resulting circuits are very simple in structure and easy to design.
Nikos Fragoulis, Ioannis Haritantis
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Exponentially tunable voltage controlled quadrature oscillator
2017 40th International Conference on Telecommunications and Signal Processing (TSP), 2017This paper deals with appropriate method of tunability extension in quadrature oscillators. Exponential dependence of frequency of oscillations on DC control voltage is created in lossless integrators by utilization of two exponentially controlled variable gain amplifiers and diamond transistors.
Roman Sotner +5 more
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A Familiy of SiGe Quadrature Oscillators for Microwave Applications
2005 IEEE International Symposium on Circuits and Systems, 2005A family of quadrature oscillators for operation in the 14-26 GHz range has been designed in a 0.25 /spl mu/m SiGe BICMOS technology with an f/sub t/ of 47 GHz. These oscillators employ a transmission line tank, an emitter degenerated cross-coupled pair, and SiGe HBT or CMOS 50 /spl Omega/ buffers.
Brian Welch +2 more
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On the numerical quadrature of highly-oscillating integrals II: Irregular oscillators
IMA Journal of Numerical Analysis, 2005The purpose of the present paper is to delve deeper into highly-oscillatory quadrature and to analyse the behaviour of the Filon quadrature for irregular oscillators of the form \[ I_g[f]:= \int^1_0 f(x) e^{i\omega g(x)}\,dx, \] where \(g\) is a real, nonzero function, \(f\) is a complex-valued function, both sufficiently smooth, and \(w\gg 1\).
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A 44 GHz Quadrature Traveling Wave Oscillator
2013 26th International Conference on VLSI Design and 2013 12th International Conference on Embedded Systems, 2013This paper presents a technique for quadrature phase generation in an LC oscillator by sharing a single turn inductor between a pair of oscillators. This special structure of the inductor cancels the magnetic flux within the loop, and thereby allows placement of other components beneath it.
Somnath Kundu, Shouri Chatterjee
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On Phase Noise in Quadrature Cross-Coupled Oscillators
2005 IEEE International Symposium on Circuits and Systems, 2005A cross-coupled relaxation oscillator has two outputs of the same frequency, which are in quadrature. In this paper a comparative study of the phase noise in a cross-coupled relaxation oscillator is given. We present a high level (system) study of the oscillator and analyse the oscillator stability.
Luís Bica Oliveira +3 more
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A 3.2-to-7.3GHz Quadrature Oscillator with Magnetic Tuning
2007 IEEE International Solid-State Circuits Conference. Digest of Technical Papers, 2007A quadrature oscillator employs a transformer-capacitor network as an energy tank. Frequency tuning is done by varying the transformer magnetic field via the ratio of currents in the two windings. Realized prototypes have a 3.2 to 7.3GHz frequency tuning range, a phase noise FOM of 176.5dB at 3.2GHz, 170.5dB at 6.4GHz, and 164dB at 7GHz, all calculated
Giuseppe Cusmai +3 more
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