Topic
Voltage-controlled oscillator
About: Voltage-controlled oscillator is a research topic. Over the lifetime, 23896 publications have been published within this topic receiving 231875 citations. The topic is also known as: VCO.
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Patent•
07 Jun 1995
TL;DR: In this article, a self-calibrating RC oscillator with a separate oscillator, such as a voltage-controlled oscillator (VCO), is described. But, this RC time constant is not used in the manner of a typical RC network to set the frequency of oscillation.
Abstract: A digitally-tuned oscillator (DTO) includes a digital-to-analog converter (DAC) and an RC oscillator The RC oscillator includes an RC circuit for forming a time constant equal to the RC product However, this RC time constant is not used in the manner of a typical RC network to set the frequency of oscillation Instead, the RC oscillator disclosed herein includes a separate oscillator, such as a voltage-controlled oscillator (VCO), and uses the RC time constant to compare with the oscillator-generated period and to adjust the frequency of the overall RC oscillator circuit in accordance with the comparison The RC oscillator is self-calibrating
62 citations
TL;DR: The demonstration that the phase noise of these nanoscale nonlinear oscillators can be tuned and eventually lessened, represents a key achievement for targeted radio frequency applications using spin torque devices.
Abstract: We investigate experimentally the synchronization of vortex based spin transfer nano-oscillators to an external rf current whose frequency is at multiple integers, as well as at an integer fraction, of the oscillator frequency. Through a theoretical study of the locking mechanism, we highlight the crucial role of both the symmetries of the spin torques and the nonlinear properties of the oscillator in understanding the phase locking mechanism. In the locking regime, we report a phase noise reduction down to $\ensuremath{-}90\text{ }\text{ }\mathrm{dBc}/\mathrm{Hz}$ at 1 kHz offset frequency. Our demonstration that the phase noise of these nanoscale nonlinear oscillators can be tuned and eventually lessened, represents a key achievement for targeted radio frequency applications using spin torque devices.
62 citations
TL;DR: A wide-range clock generation phase-locked loop incorporating several features that make it suitable for integration in highly scaled processes is described, including a fully differential supply regulated tuning scheme and the charge pump uses a resistor rather than an active current source to define the pumping current.
Abstract: This paper describes a wide-range clock generation phase-locked loop (PLL) incorporating several features that make it suitable for integration in highly scaled processes. A fully differential supply regulated tuning scheme is used to combat power supply noise. The charge pump uses a resistor rather than an active current source to define the pumping current in order to reduce the charge pump flicker noise. Fabricated in a 0.18-mum CMOS process, the PLL occupies 0.15 mm2 die area and achieves a frequency range of 0.5 to 2.5 GHz. When operating at 2.4 GHz, the power consumption is 14 mA from a 1.8-V supply while the jitter is 2.36 ps rms
62 citations
Patent•
20 Jun 1996TL;DR: In this article, a frequency-locked loop (FLL) with an oscillator whose output frequency controls the amount of charge provided by a switched feedback capacitor to a charge integrator whose output voltage controls the frequency of the oscillator is considered.
Abstract: A frequency locked loop (FLL) having an oscillator whose output frequency controls the amount of charge provided by a switched feedback capacitor to a charge integrator whose output voltage controls the frequency of the oscillator. A switched reference capacitor provides a charge to the charge integrator which is a function of a reference frequency, so that the oscillator output frequency is a function of a product of the reference frequency times a ratio of the capacitance of the reference capacitor to the capacitance of the feedback capacitor. Plural reference capacitors, each responsive to a respective reference frequency may be provided so that the oscillator output frequency can be related to the sums or differences of the reference frequencies, the ratios of capacitors, the ratio of the reference voltages or a fixed multiplication factor.
62 citations
TL;DR: In this paper, a multiphase sinusoidal oscillator using second-generation current conveyors is presented, which can generate n signals which are equal in amplitude and equally spaced in phase.
Abstract: A multiphase sinusoidal oscillator using second-generation current conveyors is presented. The oscillator can generate n signals which are equal in amplitude and equally spaced in phase. The oscillation frequency of each phase is independently controlled by a grounded resistor, which makes it easy to convert into a voltage-controlled multiphase oscillator. The proposed circuit is suitable for IC fabrication because all the passive elements are grounded. Experimental results are given to verify the theoretical analysis.
62 citations