Simultaneous Amplitude And Angle Modulation TRIZ Cases
- Fiber Optic Gyroscope Signal Rescaling for Vibration Bias Suppression
By rescaling the digital phase signal from measured intensity modulation, this case suppresses vibration bias in fiber optic gyroscopes.
- Baseband Predistortion for PWM-PPM Slewing Correction
Envelope-based phase and duty-cycle predistortion reduces PWM-PPM slewing distortion and preserves RF AM signal purity at high power.
- VSB Broadcast Receiver Equalization Using Supplementary Reference Sequences
Known data inserted into VSB stuff-byte positions gives receivers extra training for synchronization and equalization in multipath fading.
- MUROS Signal Combining with Phase Shifting for Shared GSM Timeslots
Combining and phase-shifting two baseband signals lets two users share one timeslot, boosting capacity while limiting co-channel interference.
- QAM Transmitter I/Q Calibration for Low-IF Mixer Mismatch
A loopback calibration module corrects QAM transmitter amplitude and phase mismatch from analog mixers, improving signal accuracy with less calibration time.
- Selectable LNA Mode Switching for Noise Immunity and Power Tradeoffs
Dynamic switching between differential and single-ended LNA modes improves receiver noise immunity without continuous high power draw.
- DLL Quadrature Frequency Generation With Duty Cycle Compensation
A fractional DLL and compensation network generate low-noise quadrature signals with accurate duty cycles at lower power for multiband transceivers.
- Phase Modulator Zero-Crossing Control in Polar Modulation
A 180-degree baseband phase shift handles zero crossings without forcing infinite phase-modulator bandwidth, reducing distortion.
- Digital Polar Transmitter Delay Alignment Across Multiple Clock Domains
Programmable delays, tapped delay lines, and cross-correlation align AM and PM paths in digital polar transmitters to reduce distortion.
- Physical-Layer Symbol Phase Encryption for Wireless Air Interfaces
Phase-shift encryption protects wireless symbols at the physical layer, including pilot and sync signals, to harden over-the-air links.
- Closed-Loop Polar Modulator Feedback for Stable RF Transmission
Output phase and envelope feedback stabilize a polar RF transmitter, simplify calibration, and improve PA integration and efficiency.
- Polar Modulator Extended AM Mapping for Peak FM Deviation
Threshold-based AM inversion folds strong FM impulses to cut peak deviation, reduce noise, and preserve polar transmit spectrum.
- Selective Envelope Modulation for Lower ACLR Power Draw
By slowing or disabling the amplitude path when phase modulation is sufficient, this case cuts current draw while meeting ACLR limits.
- Digital Transmitter Scrambling for Low-Power Dummy Data
Random symbol scrambling lowers dummy-data transmit power without transmitter-receiver signaling, enabling instant power reduction.
- Hybrid Modulation Circuit With Shared RF Path for Lower Power
A shared RF path combines linear and polar modulation, cutting component count and power use without PLL bandwidth limits.
- Hybrid Class-S Modulator With PWM Correction for RF Envelope Accuracy
A parallel correction circuit trims PWM quantization errors in a hybrid class-S modulator, improving RF efficiency and envelope accuracy.