Frequency-Modulated Carrier Systems TRIZ Cases

Passive RF backscatter uses retroreflective antennas and switch-based amplitude modulation to identify satellites without onboard transmission power.

Curved tapered RF projections with PCB-mounted baluns improve broadband energy capture while reducing reflections and aperture weight.

A curved segmented aperture uses tapered projections and baluns to deliver broadband RF capture with omni-directional and high-elevation coverage.

Frequency-domain downconversion with chirp-code equalization cuts processing load and improves noisy borehole telemetry recovery.

A split control path uses low-resolution A/D-D/A and ADPLL tuning to keep the varactor in its linear region while preserving demodulation SNDR.

Delay circuits and phase interpolators create half-quadrature LO phases with lower noise and power than ring oscillators or dividers.

Open-loop delay circuits and phase interpolators create half-quadrature LO phases while cutting noise and power versus DLLs.

Decoding matrices separate non-orthogonal touch signals to cut bandwidth, simplify electrode design, and lower interference risk.

Pulse-width-based phase prediction regenerates the HART data capture clock more accurately, improving demodulation under noise and waveform variation.

PMOS capacitors and variable capacitance units stabilize VCO frequency and cut low-band phase noise without enlarging the current source.

Zero-crossing synchronized CPFSK switching uses dynamic matching and DSP to support arbitrary symbol rates without energy dissipation.

Long PN codes label quadrature and polarization streams so coherent receivers can depermutate rotated channels with minimal BER impact.

A lower preamble modulation index keeps FSK packets in-band under large frequency offsets, improving receiver frequency correction accuracy.

A distortion-source mixer models and subtracts higher-order distortion, improving mixer linearity for full-duplex transceivers.

Average phase difference removal improves FSK/GFSK phase matching accuracy while keeping demodulation complexity lower than complex-domain processing.

Matrix-based demodulation separates non-orthogonal touch signals in a smaller signal band, easing bandwidth and electrode design constraints.

Average phase difference removal sharpens FSK/GFSK phase matching and enables lower-complexity demodulation with real-valued operations.

A feed-forward DAC path estimates and subtracts DDRM quantization and mismatch errors to cut spectral impurities and noise.

Multiple digital frequency envelopes decode closely spaced FSK signals at high baud rates while avoiding PLLs and dedicated tone decoders.

By pre-adjusting four-level signal transitions before transmission, the circuit preserves eye-pattern time and amplitude margins despite attenuation.

A feed-forward DAC path estimates and subtracts DDRM error sources to cut spectral impurities and noise without added modulator power or area.

Multiple ADC paths with different noise profiles are combined and imbalance-corrected to widen quadrature receiver bandwidth while lowering noise.