Frequency Demodulator Arrangements TRIZ Cases

Dynamic sampling clock phase shifts raise ADC resolution without lowering modulator frequency, helping keep filters smaller and data rates high.

Dynamic sampling clock phase shifts raise converter resolution without lowering modulator frequency, reducing filter size and cost.

Repeated triggering and phase-varied modulation enable wideband weak-signal detection while suppressing low-frequency noise.

A single image-distortion measurement sets local oscillator duty ratio to cut transmitter impairments while reducing calibration time and circuit complexity.

A phase comparator and injection-locked oscillator cut band-pass filter power below 100 nW while improving robustness to PVT variations.

A PLL-based FM demodulator tracks phase and frequency offset in weak or poor-quality signals to preserve sensitivity and audio quality.

Using phase comparison and injection locking, this filter extracts temporally modulated signals at 1.8 nW while staying robust to PVT variation.

A frequency-offset LO enables reciprocal mixing cancellation and signal isolation without extra PLLs, cutting spurious artifacts and power use.

Analog quadrature nulling plus digital temperature-based compensation improves MEMS gyroscope SNR, dynamic range, and rate offset stability.

Training-sequence-based estimation of transmitter bias and imbalance improves phase noise compensation accuracy in coherent QAM receivers.

Wide-to-narrow IF filter switching can shift passband center frequency; this case corrects PLL oscillation to preserve reception and reduce interference.

Phase-sensitive separation of 2f measurement and f fault signals normalizes gas analyzer output and compensates for transformer-related interference.

Dynamic minimum filter bandwidth based on field and modulation levels cuts FM interference without losing channel audio quality.

Repeated tracking of carrier frequency and phase changes helps receivers detect useful signals amid noise while reducing false alarms.

Sign inversion at OFDM symbol boundaries cuts multichannel DFE PAPR with low complexity while preserving orthogonality and power efficiency.

Using the interference signal itself for squared normalization improves measurement accuracy without separate current sensing hardware.

Energy comparison between on-channel and translated signals detects adjacent channel interference and retunes the local oscillator.

A split FM detection path combines AFC frequency tracking with a difference signal to cut beat noise without distorting tone squelch.

Regenerative LDA demodulation enables low-power hardwire communication in EMI environments by amplifying the modulated signal without boosting noise.

Regenerative logarithmic detector demodulation recovers weak FM or PM hardwire signals in EMI while avoiding higher transmit power.

Low-precision frequency estimation plus adaptive reference-signal subtraction cancels tone interference with lower complexity and better tracking.

A reconfigurable ADC-DAC feedback loop tracks and subtracts DC offset from modulated signals, improving dynamic range with less circuit overhead.

A second FM demodulator drives feedforward filter tracking to improve selectivity and sensitivity without adding tracking delay or instability.

Injection locking and frequency demodulation raise RF sensing sensitivity while cutting synthesizer complexity, power use, and scan delay.

Dynamic filter bandwidth and center-frequency selection lets a PLL demodulator keep high sensitivity across wider input frequency ranges.

Precomputed Taylor-series coefficients from selected FFT bins remove narrow-band RFI in multi-carrier signals with lower complexity and better accuracy.

Predicting input current waveforms suppresses zero-crossing distortion and reduces total harmonic distortion in power factor correction circuits.