Resistance/Reactance/Impedence TRIZ Cases

A ground plane or air gap shields the sensor backside, enabling low-cost one-sided touch input with fewer false triggers.

Overlapping field, shield, and extinction electrodes focus a quasi-static electric field for precise directional capacitive sensing.

A voltage drop across the amplifier's internal impedance is used to calculate load current, removing the shunt resistor and simplifying sensing.

Dual charging voltage detectors separate true touch signals from parasitic capacitance, improving detection accuracy without added circuit complexity.

Two series shunts and make-before-break switching correct offset errors in real time for accurate low-power current sensing across a wide range.

Built-in capacitive self-test compares channel values during production to catch touch sensor defects without manual test benches.

Two LC tank circuits and phase detection equalize ferrous and non-ferrous sensing distance while resisting temperature drift and magnetic fields.

A driven shield matched to the sense electrode cuts stray capacitance and electrical noise, improving touchpad signal accuracy.

Non-contact sensors and wireless signaling identify which breaker powers a distant AC line without repeated panel trips.

Adaptive electrode-specific thresholds use multi-electrode capacitance differences to speed human touch detection while reducing false positives.

Shared output terminals let a capacitive proximity sensor measure capacitance and drive LEDs, cutting pin count and cost without sensing interference.

Start symbol detection aligns loopback comparison in serial interface BIST, improving test accuracy despite variable latency and phase jitter.

A capacitive key matrix replaces resistance scanning to cut pin count and die area while enabling compact full-keyboard input.

Ratio-based counting across paired oscillators cancels mismatch and PVT variation, enabling accurate small-capacitance sensing with simpler circuitry.

Adaptive sensitivity learning tailors vehicle proximity switch thresholds to finger and glove differences, improving actuation accuracy and reliability.

Simultaneous full-screen drive sensing distinguishes grounded finger touches from water or conductive residue while lowering scan time and power.

Multiple proximity sensors distinguish sliding exploration from stable intentional input to prevent accidental switch activation in vehicles.

A no-exit-tree delay line uses separate output paths to speed measure initialization while reducing duty cycle distortion and power sensitivity.

A totem pole electrode lattice reduces touch-sensor signal disparity while improving manufacturability, yield, and optical quality.

A single oscillator alternates between reference and sensing capacitors to cut circuit cost and improve capacitance detection accuracy.

Gain and offset calibration compensates base capacitance drift and noise, improving detection of small touch capacitance changes.

A retention latch preserves the original flip-flop state during scan testing, avoiding reset delays and maintaining system continuity.

A low-impedance transmitting electrode and high-impedance receiving electrode keep capacitive sensing stable under coating, wetting, and humidity.

Positive-feedback resonance sensing separates gain from detection to measure transient frequency shifts from material electromagnetic perturbations.

A planar antenna substrate with side-fed cable enables reliable right-angle proximity sensing in slots, slits, and other tight spaces.

Matched transistor pairs enable delta double sampling in ISFET arrays to cancel offset and mismatch while lowering ADC dynamic range needs.

Parasitic capacitor discharge timing and filtering enable low-power touch and proximity sensing with strong noise rejection and no ADC.

A current-to-voltage converter and ADC hold the sense input at constant voltage to cut noise and improve touch and gesture detection.

A ground plane or air gap makes thin-film touch sensors one-sided, cutting false backside triggers and lowering cost for interactive products.

A half-wavelength strip resonator and slotted patch extend capacitive sensing range and sensitivity while keeping power use low.

A constant-current mirror branch enables AC/DC current sensing across high potential differences while preserving bandwidth and output stability.

Current conveyor oscillators turn subtle mutual capacitance changes into linear period shifts for more precise proximity and position sensing.

An insulated gasket lets a floating metal enclosure support proximity and touch sensing, enabling hidden controls and wake functions.

Using split capacitors and charge redistribution, this case preserves touch sensing resolution while preventing output voltage saturation.

A differential input sense amplifier raises gain and sensing current to narrow fuse trip point variation and offset process shifts.

A switchable capacitor and bypass path expose ohmic coupling between receiver paths, improving capacitive input error diagnosis.

Dual PLL loops and frequency up-conversion stabilize high-frequency radar signals across temperature changes, improving tank level accuracy.

Two oscillator configurations are averaged to cancel current-source mismatch and comparator-delay errors in RC time-constant calibration.

A switched sensing circuit shares one capacitor across multiple touch electrodes to cut parts, lower power, and improve noise-resistant touch detection.

Driving a shield beside the sense electrode suppresses stray capacitance and electrical noise, improving touchpad measurement accuracy.

Axisymmetrical electrodes with concentric common-potential lines improve touch-position linearity and accuracy while limiting electrode count.

Differential charge storage with dual integration capacitors speeds capacitive sensing while compensating baseline capacitance interference.

Power-grid resistance variations in an IC are used to derive a volatile PUF key that resists cloning and invasive physical attacks.

A feedback switching capacitor in a sigma-delta loop enables continuous capacitance-to-code conversion with dynamic tracking, flexible resolution, and less hardware.

Quasi-differential charge integration enables parallel capacitive sensing, improving touch matrix scan speed and baseline compensation.

Repeated charge sharing through passive impedance measures capacitance accurately with standard microcontrollers and no active analog circuitry.

A spaced sensor and guard electrode let stump cutter handles distinguish operator contact from water, reducing false activations.

A microscale multiplexer line reads individual nanowire junction conductivity states, enabling reliable and economical crossbar memory access.

Continuous phase-to-voltage calibration compensates drift during operation, keeping clearance sensing accurate without external phase references.

Automatic delay calibration compensates for temperature, voltage, and moisture shifts to keep touch sensor sensitivity stable and prevent misoperation.