Topic
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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23 May 2010
TL;DR: In this article, a 600MHz thin film bulk-acoustic wave resonator (FBAR)-based differential oscillator fabricated in a 0.13µm CMOS process is presented.
Abstract: A 600MHz thin film bulk-acoustic wave resonator (FBAR)-based differential oscillator fabricated in a 0.13µm CMOS process is presented. The oscillator employs a crosscoupled pair with an FBAR resonator tank providing high Q source degeneration to realize frequency oscillation at the series resonance. The measured phase noise is −126 and −150dBc/Hz at 10kHz and 1MHz frequency offsets respectively; the integrated RMS jitter from 10kHz to 20MHz is 50fs. The oscillator achieves a frequency drift of 50ppm over the temperature range from 25 to 110 °C, providing the potential for quartz replacement in some applications. The figure-of-merit (FOM) of the oscillator is 214dB.
31 citations
Patent•
29 Mar 1974
TL;DR: In this article, a drift compensation mechanism is incorporated in the feedback portion of the phase lock loop in order to track the difference between a reference input signal and the VCO center frequency which normally tends to drift with age.
Abstract: A phase lock loop having a crystal voltage controlled oscillator (VCO) which includes a drift compensation mechanism incorporated in the feedback portion of the loop in order to track the difference between a reference input signal and the VCO center frequency which normally tends to drift with age. If the reference signal is lost, the compensation mechanism allows the apparent center frequency for the VCO to be held close to the last known reference value rather than the potentially drift affected real center frequency of the crystal.
31 citations
TL;DR: A femtosecond optical parametric oscillator is demonstrated that can operate in a regime where two signal pulses with well-separated center wavelengths are simultaneously resonant.
Abstract: A femtosecond optical parametric oscillator is demonstrated that can operate in a regime where two signal pulses with well-separated center wavelengths are simultaneously resonant. Measurements show that the oscillator output contains a stable modulation at a frequency corresponding to the difference in the carrier-envelope phase-slip frequencies of the co-resonant pulses. The physical origin of this internal beat signal is attributed to second-order mixing effects, and its frequency is shown to be consistent with theory.
31 citations
Patent•
16 Jan 1992
TL;DR: In this paper, a high frequency heating generator is presented, which includes an electron tube amplifier, the output of which is connected to a resonant circuit that is electromagnetically coupled to a part to be heated, and a controlled frequency oscillator.
Abstract: A high frequency heating generator which includes an electron tube amplifier, the output of which is connected to a resonant circuit that is electromagnetically coupled to a part to be heated, and a controlled frequency oscillator. The oscillator outputs a high frequency signal to the input of the amplifier. It also includes circuitry to measure the phase shift between the current output to the resonant circuit and the voltage at its terminals, and to modify the frequency of the oscillator as a function of this phase shift. The invention can be applied notably to devices for heating by electromagnetic induction, dielectric losses or plasma.
31 citations
01 Apr 1979
TL;DR: In this paper, a sinusoidal oscillator is presented which employs only one operational amplifier, two capacitors, and six resistors and has the facility of independent control of oscillation frequency through a single grounded resistor.
Abstract: A novel sinusoidal oscillator is presented which employs only one operational amplifier, two capacitors, and six resistors and has the facility of independent control of oscillation frequency through a single grounded resistor. The circuit may also be used as a very-low-frequency oscillator and as an economical voltage-controlled oscillator.
31 citations