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Equivalent Capacitance

Equivalent Capacitance

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...

Equivalent Capacitance

Equivalent Capacitance

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...

Capacitors and Capacitance

Capacitors and Capacitance

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...

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.

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.
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Author Spotlight: Microfluidic Channel-Based Soft Electrodes and Their Application in Capacitive Pressure Sensing

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Mutual Capacitive Sensing Touch Screen Controller for Ultrathin Display with Extended Signal Passband Using Negative

Chang-Ju Lee^1,2, Jong Kang Park³, Canxing Piao⁴

¹College of Information and Communication Engineering, Sungkyunkwan University, Suwon 16419, Korea. changju1.lee@samsung.com.

Sensors (Basel, Switzerland)

|October 31, 2018

Summary

This study introduces a novel negative capacitance circuit to reduce coupling capacitance in flexible touch screen panels (TSPs). This innovation enhances signal reception for improved smart device performance.

Keywords:

IQ demodulation flexible display negative capacitance touch screen controller touch screen panel

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Area of Science:

Electrical Engineering
Materials Science
Human-Computer Interaction

Background:

Flexible and thin displays in smart devices suffer from large coupling capacitance in touch screen panels (TSPs).
This capacitance limits the signal passband to below 100 kHz, significantly reducing received signal integrity.
High driving frequencies (hundreds of kHz) are used for noise avoidance, further challenging signal quality.

Purpose of the Study:

To mitigate the signal degradation caused by large coupling capacitance in TSPs.
To enhance the signal-to-noise ratio (SNR) for touch input detection in flexible displays.
To enable more robust and accurate touch sensing in modern smart devices.

Main Methods:

Implemented a negative capacitance circuit in parallel with the TSP coupling capacitance to reduce effective capacitance.
Utilized an in-phase and quadrature demodulation scheme to compensate for phase fluctuations between signal and clock.
Fabricated a test chip using a 0.35 µm complementary metal-oxide-semiconductor (CMOS) process.

Main Results:

Successfully reduced the effective capacitance at the analog front-end.
Achieved a signal-to-noise ratio (SNR) of 43.2 dB for a 6 mm diameter metal pillar touch input.
Demonstrated the efficacy of the negative capacitance and demodulation techniques.

Conclusions:

The proposed negative capacitance circuit effectively overcomes the limitations of large coupling capacitance in flexible TSPs.
The combination of negative capacitance and advanced demodulation techniques significantly improves touch input signal quality.
This approach offers a viable solution for enhancing the performance of touch sensing in flexible electronic displays.