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Related Concept Videos

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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Clamper Circuit01:14

Clamper Circuit

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A clamper circuit, also known as a DC restorer, represents a specialized variant of the rectifier circuit, notable for its method of taking the output across the diode rather than the capacitor. This configuration lends to several distinctive applications, particularly in handling square wave inputs.
Within this circuit, the diode's orientation prompts the capacitor to charge up to the level of the most negative peak of the input signal. Upon reaching this state, the diode ceases to...
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Equivalent Capacitance01:19

Equivalent Capacitance

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From the study of resistive circuits, it is understood that employing a series-parallel combination serves as an effective strategy for simplifying circuits. Capacitors can be arranged within a circuit in one of two ways: a series configuration or a parallel configuration. The way these capacitors are connected to a battery will influence both the potential drop across each individual capacitor and the size of the charge that each capacitor can store. This is determined by the specific type of...
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Capacitance: Single-Phase And Three-Phase Line01:25

Capacitance: Single-Phase And Three-Phase Line

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In electrical power systems, understanding the capacitance of transmission lines is fundamental for efficient operation.
Single-Phase Lines
Consider a single-phase, two-wire transmission line with equal phase spacing energized by a voltage source. One conductor carries a uniform positive charge, while the other carries an equal negative charge. The capacitance C of the line can be derived from the voltage V between the conductors. For a one-meter section of the line, the capacitance is given...
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A High-Linearity Closed-Loop Capacitive Micro-Accelerometer Based on Ring-Diode Capacitance Detection.

Qi Tao1, Bin Tang1

  • 1China Academy of Engineering Physics, Institute of Electronic Engineering, Mianyang 621000, China.

Sensors (Basel, Switzerland)
|February 11, 2023
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Summary
This summary is machine-generated.

This study introduces a novel closed-loop capacitive accelerometer using ring-diode capacitance detection. The new design significantly reduces non-linearity, achieving 130 ppm compared to 1500 ppm in open-loop systems.

Keywords:
MEMScapacitive accelerometerclosed-looplow non-linearity

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Area of Science:

  • * Electrical Engineering
  • * Mechanical Engineering
  • * Materials Science

Background:

  • * Capacitive accelerometers are crucial for motion sensing.
  • * Existing designs often suffer from non-linearity, limiting precision.
  • * Ring-diode capacitance detection offers potential for improved performance.

Purpose of the Study:

  • * To develop a high-linearity closed-loop capacitive accelerometer.
  • * To correct errors in existing ring-diode capacitance detection models.
  • * To implement an integrated closed-loop control scheme for MEMS accelerometers.

Main Methods:

  • * Deduction and correction of the ring-diode capacitance detection model.
  • * Design of a closed-loop scheme reusing detection and control electrodes.
  • * Analysis and mitigation of non-linearities in closed-loop control.

Main Results:

  • * Experimental validation of the corrected ring-diode detection model.
  • * Achieved non-linearity of 130 ppm within ±1 g in the closed-loop accelerometer.
  • * Demonstrated significant reduction in non-linearity compared to open-loop systems (1500 ppm).

Conclusions:

  • * The proposed integrated closed-loop scheme enhances accelerometer linearity.
  • * The corrected ring-diode model accurately predicts experimental outcomes.
  • * This advancement offers improved precision for MEMS accelerometers.