Angle Modulation TRIZ Cases
- Stacked Phase Modulation Surface for Continuous Wide-Range Control
Stacked phase-shifting layers and a tunable dielectric enable continuous, precise phase control with wider range and less wiring complexity.
- Adaptive LDO Biasing for Low-Error Digital-to-Time Converters
Dynamic LDO bias control tracks DTC input changes to cut settling-time supply disturbances and reduce RF phase modulation errors.
- 4FSK Transceiver Architecture for Multi-Gb/s Low-Power Links
A single-VCO 4FSK architecture uses parallel bit streams and non-coherent reception to reach multi-Gb/s links with lower power and complexity.
- Shared Modulator-Demodulator Circuit Using a Delay-Line Ring Oscillator
One delay line serves both modulation and demodulation as a ring oscillator, removing PLL lock time while cutting transceiver area and power.
- Phase-Controlled UWB Pulse Generator Using a Switched LC Oscillator
Current injection sets UWB pulse startup phase in a switched LC oscillator, enabling BPSK and tighter spectral control at multi-GHz frequencies.
- PLL Error-Signal Scaling for Frequency-Independent Gain Calibration
A sign-based scaling controller uses PLL error feedback to calibrate oscillator gain during operation without frequency-dependent tuning.
- QAM Test Point Power Monitoring for Automatic Channel Alignment
A tunable monitor inside the QAM modulator measures RF channel power and drives gain adjustment without external spectrum analyzers.
- Microprocessor Voltage Droop Monitoring With Temporary Clock Skipping
A digital monitor detects inductive voltage droops and briefly skips clock cycles to stabilize supply voltage, preserve speed, and cut power.
- Multi-Mode VCO Switching for Accurate Direct FM With Lower Phase Noise
A switched LC tank and PLL architecture enables direct FM across modes while balancing modulation accuracy and phase noise.
- QPSK Modulator Mapping for 16QAM Without Variable Weights
Two QPSK modulators with constant weights and fixed DTX bits generate 16QAM constellation points while reducing processing and bus load.
- Differential Active Mixer With Bandwidth Peaking for Flat Gain
Series coil-resistor peaking and common-mode biasing extend a differential active mixer's bandwidth while holding gain steady from DC to 20 GHz.
- Frequency-Hopping QAM Synchronization Using Pilot Tones
Pilot tones and pseudo-noise sequences enable rapid carrier and clock frequency synchronization in quadrature amplitude modulated signals.
- Wideband Quadrature Imbalance Compensation via Segmented Estimation
Segmenting the frequency band into sub-bands allows dynamic phase error tracking, correcting gain and phase imbalance variations across wide bandwidths.
- DQPSK Modulator Bias Control via Time-Division Dither Injection
A single monitor photodiode sequentially detects dither tones injected into I-arm, Q-arm, and phase modulators to adjust bias points.
- RF Drive Level Control for Electro-Optic Phase Modulators
A carrier suppression ratio measurement eliminates parasitic loading and calibration drift in electro-optic phase modulators.
- Parallel Upsampling Circuit for High Data Rate Modulation
Parallel circuit architecture upsamples digital data streams via polyphase Nyquist filters to overcome FPGA clock speed limits.