Measuring the quality factor of low-frequency quartz resonators

1986 ◽  
Vol 29 (3) ◽  
pp. 218-220
Author(s):  
B. N. Konshin
Keyword(s):  
Quality Factor ◽  
Low Frequency ◽  
Quartz Resonators

Low-frequency heat-sensitive quartz resonators

1978 ◽  
Vol 21 (1) ◽  
pp. 110-111
Author(s):  
M. I. Yaroslavskii ◽  
A. P. Fedorkov
Keyword(s):  
Low Frequency ◽  
Quartz Resonators

scholarly journals Measurement of the quality factor of a new low-frequency differential accelerometer for testing the equivalence principle

2014 ◽  
Vol 85 (1) ◽  
pp. 014502 ◽  
Author(s):  
V. Iafolla ◽  
C. Lefevre ◽  
E. Fiorenza ◽  
F. Santoli ◽  
S. Nozzoli ◽  
...  
Keyword(s):  
Quality Factor ◽  
Equivalence Principle ◽  
Low Frequency

scholarly journals Realization of SIMO biquad filters and quadrature sinusoidal oscillators using OTRAs

2021 ◽  
Author(s):  
Garima Garima ◽  
◽  
Pragati Kumar ◽  
Data Ram Bhaskar ◽  
◽  
...  
Keyword(s):  
Quality Factor ◽  
Experimental Validation ◽  
Low Frequency ◽  
Spice Simulation ◽  
Sinusoidal Oscillators ◽  
Input Multiple Output ◽  
Condition Of Oscillation ◽  
Single Input ◽  
Simulation Results ◽  
Quality Factor Q

In this communication, two single-input multiple-output (SIMO) type biquad filters employing operational transresistance amplifiers (OTRAs) have been presented. Various parameters of the proposed filter circuits viz. pole frequency (ɷ), pole quality factor (Q) and the gain are independently controllable. The proposed filter configurations can also be converted into low frequency oscillators with fully uncoupled control of condition of oscillation and frequency of oscillation with quadrature output voltages. The active and passive sensitivities of the proposed circuits have been found to be small. SPICE simulation results and experimental validation of the proposed circuits employing OTRAs realized with AD844 type CFOAs have also been presented.

scholarly journals Magnetic Pendulum Arrays for Efficient ULF Transmission

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Srinivas Prasad M N ◽  
Rustu Umut Tok ◽  
Foad Fereidoony ◽  
Yuanxun Ethan Wang ◽  
Rui Zhu ◽  
...  
Keyword(s):  
Quality Factor ◽  
Free Space ◽  
Low Frequency ◽  
Transmission Efficiency ◽  
Experimental Results ◽  
Proof Of Concept ◽  
Electrically Small Antennas ◽  
Fundamental Limits ◽  
Small Antennas ◽  
Order Of Magnitude

Abstract The frequencies lying between 300 Hz to 3 kHz have been designated as Ultra Low Frequency (ULF) with corresponding wavelengths from 1000 Km to 100 Km. Although ULF has very low bandwidth it is very reliable, penetrating and difficult to jam which makes it a great choice for communication in underwater and underground environments. Small and portable ULF antennas within a diameter of 1 meter would operate under an electrical length on the order of 10−4 to 10−6 wavelengths in free space, making them very inefficient because of fundamental limits on radiation from electrically small antennas. To overcome this problem, Mechanical Antennas or ‘Mechtennas’ for Ultra Low Frequency Communications have been proposed recently. For efficient generation of ULF radiation, we propose a portable electromechanical system called a Magnetic Pendulum Array (MPA). A proof of concept demonstration of the system at 1.03 kHz is presented. The theory and experimental results demonstrate that such a system can achieve a significantly higher quality factor than conventional coils and thus order of magnitude higher transmission efficiency. The concept can be easily scaled to the ULF range of frequencies.

NOISE CHARACTERISTICS OF 340 nm AND 280 nmGaN-BASED LIGHT EMITTING DIODES

2004 ◽  
Vol 14 (03) ◽  
pp. 702-707
Author(s):  
SHAYLA SAWYER ◽  
SERGEY L. RUMYANTSEV ◽  
NEZIH PALA ◽  
MICHAEL S. SHUR ◽  
YURIY BILENKO ◽  
...  
Keyword(s):  
Light Intensity ◽  
Quality Factor ◽  
Light Emitting Diodes ◽  
Low Frequency ◽  
Low Frequencies ◽  
Light Emitting ◽  
Visible Wavelength ◽  
Noise Characteristics ◽  
Uv Leds ◽  
Halogen Lamps

Low frequency fluctuations in light intensity of 340 nm and 280 nm GaN -based light emitting diodes (LEDs) are compared with noise properties of other commercially available UV and visible wavelength LEDs and halogen lamps. At low frequencies, LEDs can exhibit lower levels of noise than halogen lamps. An LED noise quality factor β is estimated for the UV LEDs.

Physical limitation on the quality factor of quartz resonators

1993 ◽  
Vol 94 (2) ◽  
pp. 917-922 ◽  
Author(s):  
A. El Habti ◽  
A. Zarka ◽  
F. Bastien
Keyword(s):  
Quality Factor ◽  
Physical Limitation ◽  
Quartz Resonators
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