Capacitance Measurements TRIZ Cases

A guard-driven floating reference lets capacitive sensors detect objects centimeters away while integrating lighting or displays without added parasitic noise.

A two-stage charge-discharge sequence cuts door-handle sensor power use while preserving hand-detection range, response, and low false alarms.

Low-frequency switching of a parallel reference impedance enables calibration without disconnecting the unknown impedance or stopping measurement.

Precharging a measurement capacitor with capacitive and resistive paths cuts comparator delay for faster touch and proximity sensing.

Premeasured charge times let the circuit subtract parasitic capacitance effects and detect object capacitance changes more accurately.

Sensing electrodes and a feedback driver detect and cancel common-mode motion, preserving differential oscillation accuracy in multi-mass resonators.

Inactive dummy electrodes equalize TX-RX mutual capacitance, cutting baseline capacitance, power use, and measurement time while preserving sensitivity.

A ring-pattern top layer and guarded second layer cut ITO use, simplify 3D touch sensor routing, and improve yield.

Capacitive sensing combines touch and proximity detection to control vehicle locks and latches while filtering spurious inputs.

A shared ADC and time-divided capacitance evaluation improve touch-panel variation detection while reducing circuit area and cost.

Differential comparison of sensor and reference capacitors cancels input voltage noise for more accurate touch capacitance measurement.

Hardware sequencing automates CVD conversion in a microcontroller ADC, cutting processor overhead while improving timing precision and touch accuracy.

Voltage sampling with a transconductance amplifier mirror speeds capacitance sensing while reducing delay from charge balance.

A guard electrode driven at sensor potential suppresses stray capacitance, enabling longer-range capacitive detection with nearby lighting or display electronics.

Pulse-width self-calibration helps a touch sensor detect low-capacitance contact accurately despite voltage, temperature, and noise changes.

A chopping circuit flips capacitive sensor outputs into a differential amplifier to spread EMI beyond the band of interest and improve inertial sensor robustness.

Separate switching stages and charge accumulation isolate self and mutual capacitance, improving touch sensor measurement accuracy.

Switching capacitor circuits separate self and mutual capacitance measurement to improve touch sensor accuracy and multi-touch sensitivity.

Alternating charging periods and repetition counts let the sensing circuit separate water adhesion from human touch and avoid false locking events.

Ramp-rate comparison between variable and reference capacitors filters interference and improves touch capacitance measurement accuracy.

Using capacitance change rate instead of fixed thresholds improves touch detection across dielectric variation, noise, and gloved input.

A calibrated compensation current cancels baseline parasitic and mutual capacitance, improving small-change sensing resolution and dynamic range.

A sigma-delta readout converts sensed capacitance into pulse duty cycle, avoiding exponential voltage nonlinearity while improving noise immunity.

Non-overlapping single-layer electrodes detect touch position from signal patterns, cutting noise distortion and channel count in capacitive sensors.

Selective x-y electrode scanning improves touch position detection by enabling demodulated capacitive measurements without controlling external object voltage.

A calibrated compensation current cancels baseline parasitic and mutual capacitance, improving finger proximity detection resolution.

Interleaving sense elements extend electrodes beyond sensor pitch to remove dead zones and improve narrow stylus touch accuracy.

Adjustable charge and discharge duty cycles keep touch capacitance readings accurate across panel variations while reducing EMI.

Processing logic removes parasitic tail signals from unsettled capacitive sensor readings, improving touch accuracy without slowing response.

An actively driven shield shapes the wire electric field to limit external coupling, reducing attenuation and false touch inputs.

A reconfigurable self-capacitance circuit measures mutual capacitance for accurate multi-touch detection without separate sensing hardware.

Noise suppression, phase control, and beat detection stabilize capacitive proximity sensing in displays for reliable user detection and energy saving.

Switched charge accumulation separates self and mutual capacitance readout to improve touch-screen sensing accuracy and reliability.

Unwanted charge is transferred to a reference path to cancel parasitic capacitance, improving CMOS capacitance measurement sensitivity and linearity.

Comparator timing with a measurement capacitor improves capacitive touch voltage sensing accuracy while reducing measurement time for touch and proximity detection.

A low-impedance square-wave driver and separate current sensing path improve capacitance measurement accuracy while reducing stray-capacitance error and power use.

A current mirror cancels parasitic charge in charge-transfer capacitance sensing, improving sensitivity, noise immunity, and accuracy.

A sigma-delta charge-transfer circuit turns exponential capacitance sensing into a linear duty-cycle signal with better noise immunity.

Switching sequences separate self and mutual capacitance effects, improving touch sensor accuracy and sensitivity in multi-touch measurement.

An integrator-discharge circuit carries quantization remainder into the next conversion to improve capacitance sensing resolution, linearity, and noise response.

Comparator-based charging and discharge control improves touch capacitance detection accuracy while reducing false triggers from external noise.

Capacitive sensing combines touch and proximity inputs to control door locks and latches with fewer sensors and fewer false triggers.

Switched guard voltages shield sensing electrodes from noise and parasitic capacitance, improving proximity sensor resolution.

Constant-current capacitor charging measures event timing and delay with picosecond resolution while avoiding ultra-high-speed clocks and digital noise.

Dynamic guard voltages track sensing electrodes during charge transfer to suppress spurious coupling without the parasitics of ground-plane shielding.

Charge-transfer sensing shares passive networks, reference conditioning, and guarding electrodes to cut capacitance sensor complexity and cost.

Alternating the sensor capacitor between current source and ground cuts noise, enabling precise capacitance and position measurement.

Shared passive networks, reference circuits, and guard electrodes cut capacitance sensor complexity while preserving accurate sigma-delta measurement.

Alternating reference-voltage polarity cancels ESD-related leakage currents, enabling precise capacitance readout at high temperatures.

Using three or more sensor electrodes, this case improves capacitive button actuation accuracy by rejecting unintended touches and false inputs.