Resistance/Reactance/Impedence TRIZ Cases

Dual AC voltages balance shield and electrode potentials to cancel parasitic capacitor current and improve sensing accuracy and dynamic range.

DC input voltage and output current feedback replace extra isolated transformers, cutting RF leakage current while maintaining electrosurgical power control.

AC grounding with a two-wire diagnostics circuit monitors frame impedance and shift voltage to prevent false capacitive sensor detections.

DC input voltage and output current feedback replace RMS voltage sensing to reduce isolation-barrier leakage in electrosurgical RF generators.

Base capacitance offsetting lets touch sensing circuits detect tiny self-capacitance changes without noise masking or saturation.

Synchronous rectification and bandpass filtering help a capacitive sensor switch resist external noise and reduce radiation in high-EMI settings.

Embedded conductive fibers turn a composite vehicle part into an invisible capacitive interface for proximity and position sensing.

Alternating DAC hardware between excitation and feedback paths cancels intrinsic noise errors and stabilizes impedance measurements over time.

Quadrature oversampling lets an RQL receiver recover timing and capture high-speed serial data without PLLs in cryogenic environments.

A comb-like electrode inside the NFC coil saves door-handle PCB space while limiting eddy currents and preserving capacitive sensing.

Quadrature sinusoidal injection and current sensing enable silent, wideband loudspeaker fault detection during normal audio operation.

AC calibration voltage compensates parasitic capacitance in nanopore current measurement, improving waveform accuracy and bandwidth.

Digitally generated quadrature probe signals let audio amplifiers track loudspeaker impedance accurately during silent operation and across audible frequencies.

A single ADC with switched sigma-delta feedback loops measures reference and unknown resistor voltages accurately with lower circuit complexity.

Phase detectors stop after enough coarse and fine scale data is captured, cutting power use in absolute displacement measurement.

Differential transconductance current generation improves AC sensing accuracy, efficiency, and CMRR without matched resistors or grounding.

A normalized differential-to-common-mode readout improves MEMS capacitive sensor linearity, noise performance, and mismatch tolerance.

Adaptive ratio-metric excitation improves sigma-delta capacitance sensing linearity, sensitivity, and pressure-change resolution.

A single ADC with switchable inputs and feedback measures reference and unknown resistances accurately while reducing interface complexity.

A single IDC channel separates multiple resonant sensors by distinct frequency states, improving target position and proximity sensing accuracy.

Analog switches isolate each sensor during impedance measurement, reducing cross-talk, on-resistance effects, and noise errors.

Charge-threshold excitation lets an LC sensor transfer energy without a high-speed clock, cutting power use and improving PVT robustness.

A pulse-width-controlled switch-capacitor circuit measures amplifier bandwidth on chip, avoiding costly high-frequency test equipment.

Ratio-based calibration cancels ADC gain and offset errors to improve variable resistance sensor measurement with low temperature sensitivity.

Matched AC shield and attenuated reference voltages cancel residual parasitic current, improving capacitance sensing accuracy and noise performance.

Near-field coupled signal measurements identify antenna type and internal structure in handheld devices without disassembly or VNA testing.

Closed-loop energy transfer in an LC sensor cuts power use, speeds measurement, and improves robustness to PVT variation.

An NLTL with a logic gate and amplifier sharpens RF waveforms to generate stable harmonics for accurate broadband phase measurement.

A single-source IQ modulation and mixing scheme cancels shared phase noise to produce a cleaner local oscillator for more accurate VNA measurements.

Single-phase charge-and-sample readout cuts overclocking, lowering power and noise sensitivity while preserving capacitive sensing response.

A negative resistance target circuit cancels resonator losses to extend inductive sensing range while preventing autonomous oscillations.

A one-piece metal housing with a thick casing protects the coil from contact abuse and helps inductive sensors resist high shear forces.

A reference-capacitor charge transfer approach improves steering wheel contact sensing despite temperature shifts, humidity, and sensor drift.

Relay switching lets an electrosurgical generator power monopolar and bipolar hand pieces at the same time, cutting procedure delays.

Switched reference and sensor voltages let one sigma-delta ADC derive resistance ratios with fewer conversions and higher accuracy.

DC input voltage and output current are used to estimate RF output voltage, reducing isolation-barrier leakage in electrosurgical generators.

A single digital I/O pin uses resistor-set voltage levels and timed sampling to encode multi-bit chip configuration while reducing package pins.

Pre-accumulating excitation energy to a charge threshold lets LC sensors oscillate without high-speed clocks, reducing power use and PVT sensitivity.

Conductive ink printing combines sensing and shielding loops on one steering wheel mat to cut metal-frame interference and simplify assembly.

Passive triboelectric sensing detects touch and motion by measuring charge displacement, avoiding active fields for scalable low-energy surfaces.

An internal current source and voltage sampling circuit measure TIA gain directly, cutting test cost and setup complexity in batch production.

A two-sided electrode layout on one substrate cuts capacitive image sensor complexity and cost while preserving sensing performance.

By switching power or output terminals into a data mode when abnormal states are detected, packaged sensor modules regain memory access.

By measuring DC and AC headphone load in the audio codec, the device can identify the transducer and apply matching equalization.

Threshold-based reference selection from multiple capacitive detectors improves steering wheel hand-contact detection when startup contact skews baseline values.

A low-frequency sync signal over fiber with coarse and fine phase counters preserves accurate remote phase measurement over long distances.