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Related Concept Videos

Equivalent Capacitance01:19

Equivalent Capacitance

1.5K
Multiple capacitors can be connected in a circuit in series or parallel configuration. When the capacitor combination is connected to a battery, the potential drop across each capacitor and the magnitude of charge stored in the individual capacitor depends on the type of the connection. The capacitor combination is replaced by a single equivalent capacitor that stores the same amount of charge as the combination for a given potential difference.
The following strategies are adopted to calculate...
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Capacitors01:15

Capacitors

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Capacitors play a crucial role in car radios, where they filter and store frequencies to ensure clear signal reception. Essentially serving as energy storage devices, capacitors store energy within their electric field and are composed of two parallel conducting plates separated by a dielectric.
When a voltage source is connected to a capacitor, positive and negative charges accumulate on the opposite plates. This accumulation generates a potential difference that equals the product of the...
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Capacitors and Capacitance01:18

Capacitors and Capacitance

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A device consisting of two electrical conductors that are separated by a distance and used to store electrical charges is called a capacitor. The space between the conductors is either a vacuum or an insulating material, called a dielectric. Capacitors have many applications, ranging from filtering static from radio reception to energy storage in heart defibrillators.
When the conductors are two identical parallel plates, it is called a parallel plate capacitor. When battery terminals are...
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Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

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In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
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Capacitor With A Dielectric01:18

Capacitor With A Dielectric

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Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
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Multiple Quartz Crystals Connected in Parallel for High-Resolution Sensing of Capacitance Changes.

Vojko Matko1

  • 1Faculty of Electrical Engineering and Computer Science, University of Maribor, Koroška c. 46, 2000 Maribor, Slovenia.

Sensors (Basel, Switzerland)
|July 9, 2022
PubMed
Summary

This study introduces a novel capacitance sensor using parallel quartz crystals for highly sensitive measurements. The method achieves sub-attofarad resolution by compensating for temperature variations and other interferences.

Keywords:
multiple quartz crystals in parallelquartz capacitive sensing methodswitching mode methodtemperature compensation

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Area of Science:

  • Electrical Engineering
  • Sensor Technology
  • Materials Science

Background:

  • Capacitance sensors are crucial for precise measurements.
  • Quartz crystal oscillators exhibit nonlinear frequency-temperature dependence.
  • External factors like aging and voltage fluctuations affect oscillator frequency.

Purpose of the Study:

  • To develop a highly sensitive, low-value capacitance sensor.
  • To achieve temperature compensation for quartz crystal oscillators.
  • To minimize experimental error in capacitance measurements.

Main Methods:

  • Utilizing multiple quartz crystals connected in parallel within an oscillator.
  • Implementing a switching mode method for temperature compensation (0-50 °C).
  • Employing delayed switches for capacitance measurement error reduction.

Main Results:

  • Achieved sub-attofarad (aF) resolution in capacitance sensing.
  • Successfully compensated for temperature, aging, and voltage fluctuations.
  • Converted capacitance changes (10 zF–200 fF) to frequency shifts (4 kHz–100 kHz).

Conclusions:

  • The developed sensor offers unprecedented sensitivity for low-value capacitance detection.
  • The switching method effectively enhances the stability and accuracy of quartz crystal oscillators.
  • This technology enables precise measurements even under dynamic environmental conditions.