Carrier Regulation TRIZ Cases
- RF DAC Multiphase Pulse Duty Cycling for HD3 Cancellation
Multiphase LO pulses with about 33% duty cycle create a third-harmonic null, cutting HD3 and CIM3 without large LC filters.
- AFC Doppler Compensation During Cell Handover
Using the source-cell Doppler estimate and its inverse, this case stabilizes CFO compensation during handover without GPS.
- Radar transmitter module for digital modulation
Combining a digital sequence with phase-delayed copies redistributes spectral energy to lower radar side-lobe power and meet power masks.
- Wideband Quadrature LO Generation With Polyphase and Divider Paths
A frequency-based switch between polyphase filter and divider paths keeps quadrature LO amplitude and phase balanced across wideband operation.
- Banked Correlator Carrier Frequency Estimation for Bluetooth Receivers
Parallel correlators test multiple frequency offsets during the preamble, extending capture range and lowering Bluetooth packet errors.
- Pulse Transition Encoding for High-Throughput Signal Transmission
Encoding data by pulse transition position and width raises throughput while limiting ISI, protecting SNR, and reducing power use.
- Telemetry Signal Date-Stamping via Coherent Phase Demodulation
Coherent phase demodulation replaces jitter-prone re-sampling to date-stamp telemetry bit transitions more accurately for aircraft and spacecraft ranging.
- Crystal-Less BLE Transceiver Using Packet-Recovered Frequency Reference
Recovers a reference from incoming BLE packets to lock on-chip oscillators, removing the crystal while keeping frequency accuracy and fast locking.
- IQ Mismatch Correction Using Powerup-to-Steady-State Estimation
Interpolated updates align powerup IQ estimates with steady-state drift, improving zero-IF receiver correction accuracy at startup.
- Low-IF Receiver Image Cancellation for I-Q Imbalance Blocking
Selective digital correction cancels blocking-signal images from I-Q imbalance in low-IF receivers, improving SNDR without continuous processing.
- AoA Carrier Frequency Offset Correction Using Phase Oversampling
Oversampled phase tracking compensates carrier frequency offset so AoA and AoD algorithms can calculate signal direction more accurately.
- Dual CORDIC Down-Conversion for I/Q Mismatch Compensation
Two CORDIC rotators add phase offset and gain correction to compensate I/Q mismatch in receiver down-conversion across varying IFs.
- Optical Transmitter IQ Imbalance Compensation Using Transform Matrices
A transform matrix model stabilizes optical transmitter IQ phase offset estimation, restores constellation alignment, and lowers bit errors.
- Quadrature Signal Imbalance Estimation via Spectral Symmetry
Spectral symmetry analysis estimates quadrature amplitude and phase imbalance quickly, reducing image artifacts without pilot tones or training data.
- Wideband Quadrature LO Generation With Frequency-Based Path Switching
A polyphase filter and 2:1 divider are switched by output frequency to keep quadrature LO amplitude and phase balanced across wide bands.