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Frequency drift

About: Frequency drift is a research topic. Over the lifetime, 5054 publications have been published within this topic receiving 56191 citations. The topic is also known as: chirp rate.


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Patent
16 Mar 2009
TL;DR: In this paper, a bimorph beam is configured to increase the spacing between the first and second electrodes in response to an increase in temperature of the micro-electromechanical device.
Abstract: Micro-electromechanical devices include a temperature-compensation capacitor and a thin-film bulk acoustic resonator having a first terminal electrically coupled to an electrode of the temperature-compensation capacitor. The temperature-compensation capacitor includes a bimorph beam having a first electrode thereon and a second electrode extending opposite the first electrode. This bimorph beam is configured to yield an increase in spacing between the first and second electrodes in response to an increase in temperature of the micro-electromechanical device. This increase in spacing between the first and second electrodes leads to a decrease in capacitance of the temperature-compensation capacitor. Advantageously, this decrease in capacitance can be used to counteract a negative temperature coefficient of frequency associated with the thin-film bulk acoustic resonator, and thereby render the resonant frequency of the micro-electromechanical device more stable in response to temperature fluctuations.

16 citations

Journal ArticleDOI
TL;DR: In this article, a differential birefringent fiber frequency-modulated continuous-wave Sagnac gyroscope was proposed to eliminate the unexpected non-reciprocal phase drift (including the frequency drift of the light source) and make the resolution double.
Abstract: A differential birefringent fiber frequency-modulated continuous-wave Sagnac gyroscope is described. Due to the nature of the differential interferometer structure, the gyroscope can automatically eliminate the unexpected nonreciprocal phase drift (including the frequency drift of the light source) and make the resolution double.

16 citations

Proceedings ArticleDOI
01 Dec 2011
TL;DR: In this paper, a 4 MHz current control ring oscillator with a new temperature and supply voltage immune current reference implemented by 0.35nm CMOS technology is presented, which is designed by combining positive and negative temperature effect circuits.
Abstract: This paper presents a 4 MHz current control ring oscillator with a new temperature and supply voltage immune current reference implemented by 0.35nm CMOS technology. Compared to the conventional oscillator with current reference techniques, the proposed approach shows a significant improvement for the sensitivities of temperature and supply voltage. The current reference is designed by combining positive and negative temperature effect circuits, such that it can exempt from the temperature and supply voltage variations. By HSPICE simulation, this new current reference is insensitive to the supply voltage with variations of −0.47%∼0.67% over the supply voltage range of 2.97V to 3.63V, and it is also insensitive to the temperature with variation of 366 ppm/°C over the temperature range of −40°C to 100°C. The proposed oscillator frequency is insensitive to the supply voltage with variations of −15%∼20% over the supply voltage range of 2.97V to 3.63V, and it is insensitive to temperature with variation of 404 ppm/°C over the temperature range of-40°C to 100°C.

16 citations

Patent
15 Jul 1986
TL;DR: In this paper, a radio frequency transmitter simultaneously transmits both a local oscillator frequency and that frequency modulated by an information content signal, and the receiver receives a carrier wave that is at the opposite edge of a channel from that of the local oscillators.
Abstract: A radio frequency transmitter simultaneously transmits both a local oscillator frequency and that frequency modulated by an information content signal. A receiver receives a carrier wave that is at the opposite edge of a channel from that of the local oscillator. The transmitted and received information signals can be of opposite type sidebands.

16 citations

Patent
13 May 1988
TL;DR: In this paper, a multimode sensor system that transmits power down a common bus coaxial cable typically using an alternating current power source was proposed. But the system is not suitable for the use of a large number of sensors.
Abstract: The present invention is a multimode sensor system that transmits power down a common bus coaxial cable typically using an alternating current power source. Each remote unit connected to the coaxial cable and through an isolation transformer converts the alternating current power to direct current power for an integrated circuit bus interface. The interface is connected to the sensors. The interface is externally pin programmable to provide a carrier at a frequency for a channel assigned to the remote unit. The carrier is provided by a ripple counter producing a frequency divided signal compared to a fixed reference frequency, where the result of the comparison controls a voltage controlled oscillator. When plural low frequency analog signals are to be transmitted over the common bus, an on-chip multiplexer multiplexes the signals to an off-chip, external analog-to-digital converter. The analog-to-digital converter loads an on chip parallel to serial register that applies each bit of the sampled signal serially to an on chip Manchester encoder. The encoder modifies the input voltage of the voltage controlled oscillator operating at the carrier frequency. The oscillator signal is applied to the coaxial cable. Receivers at the end of the coaxial cable are each tunable to a designated carrier frequency and each decode the respective encoded signal. If a high frequency analog signal is supplied to the voltage controlled oscillator, the carrier is modulated by the high frequency signal and the receiver demodulates the signal. The integrated circuit is arranged so that the digital circuitry is generally isolated from the analog circuitry so noise immunity is enhanced.

16 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20237
202217
202150
202059
201963
201887