Amplitude Modulation Details TRIZ Cases
- Power Amplifier Supply Modulation Using Open-Loop Valley Regulation
Valley detection adjusts power amplifier supply voltage to track AM signal envelopes, cutting headroom loss while maintaining reliable operation.
- Quadrature AM Noise Estimation for Pulse Interference Suppression
Quadrature demodulation estimates overlapping pulse noise in AM radio signals and removes it by spectral subtraction without extra antennas.
- Zero-IF Transmitter Decoupling Stage for Noise and LO Leakage
An intermediate decoupling stage between the mixer and gain stage cuts noise and power use while stabilizing I-Q mismatch and LO leakage.
- AM Signal Noise Estimation via Quadrature Spectral Subtraction
Quadrature-based noise estimation and spectral subtraction suppress dense EV pulse interference in AM radio receivers without extra antennas.
- Zero-IF Transmitter Decoupling for Low-Noise Gain Control
An intermediate decoupling stage between the mixer and gain stage cuts noise and power use while stabilizing I-Q mismatch and LO leakage.
- Quadrature Power Amplifier Supply Modulation for RF Linearity
Variable supply and gain paths with pre-distortion improve RF power amplifier efficiency and linearity while limiting adjacent channel leakage.
- Quadrature Power Amplifier with Dynamic Supply Modulation
Dynamic I/Q supply and gain control boosts RF power amplifier efficiency while pre-distortion preserves linearity and limits adjacent channel interference.
- Square-Wave Signal DC Offset Cancellation by Time-Domain Feedback
Integration and differentiation estimate and cancel DC offset in modulated square-wave signals, improving accuracy with lower circuit complexity.
- Parametric Audio Pre-Distortion for Harmonic Distortion Reduction
Inverse transfer function preprocessing pre-distorts parametric audio input to cut harmonics and linearize acoustic output.
- RF Hyperthermia Feedback Modulation for Selective Tissue Heating
Feedback-modulated RF hyperthermia uses tissue conductivity differences to heat targets selectively while limiting healthy tissue damage.
- AM Transmitter Gain Control for Low-Distortion Modulation
APC-driven gain control linearizes AM modulation up to 100%, cutting distortion and reducing transmitter size and component count.
- RF Power Amplifier Envelope Supply Predistortion for Linearity
A predistorted AM envelope supply improves RF power amplifier linearity and efficiency while reducing bandwidth and power loss.
- RFID Read-Write Station Modulation for Spectrum Mask Compliance
Varying RFID modulation parameters over time spreads spectral peaks, enabling maximum transmit power within regional spectrum masks.
- Dual-Path Phase Modulation for Linear RF Amplitude Control
Two phase-modulated RF paths with feedback loops create linear amplitude output while preserving class C amplifier efficiency and low phase noise.
- Electric Fence Energiser Pulse Control for Variable Fence Losses
Pulse energy and waveform are adjusted from measured fence losses to maintain effective voltage while reducing waste and safety risk.
- Laser Bias Control with Anti-Clipping for Cross Modulation Reduction
Envelope-based bias control prevents laser clipping from RF peaks while clamping bias swings to reduce cross modulation and support higher OMI.
- Digital Modulation Circuit Without PLL for Simpler Synchronization
A counter-based digital modulator replaces PLL circuits to cut transmitter power and simplify carrier synchronization in UWB communication.
- SSB Modulator Feedback Calibration for Spur Suppression
An IF feedback loop tunes phase, amplitude, and common-mode settings to suppress sidebands and LO bleed-through as modulators age.
- FM Baseband Precompensation for Bandwidth Reduction and Low Distortion
An iterative FM baseband precompensation loop cuts analog sideband power for digital subcarriers while keeping demodulated audio distortion controlled.
- Parallel-Hybrid Amplitude Modulator DC Current Compensation
Current sensing detects direct current at the linear part output, allowing the switching part to compensate and minimize energy loss from low efficiency.
- Wireless Power Transmitter Circuit Complexity Reduction
A wireless power transmitting device modulates phase and amplitude signals to optimize transmission efficiency.