Resonant Circuit Tuning TRIZ Cases
- Display PLL Clock Recovery With LC VCO Tuning for Low Jitter
A display timing controller cuts clock jitter by selecting a VCO and using LC coarse and varactor fine tuning across a wide frequency range.
- PLL Temperature Compensation Using Error-Driven VCO Correction
Threshold-based error monitoring corrects VCO drift in a PLL without temperature sensors, helping prevent unlock during temperature changes.
- Digital Capacitance Calibration for Stable Filter Cutoff Frequency
A comparator-guided digital capacitance circuit auto-calibrates on-chip filter cutoff frequency to offset process variation and preserve signal quality.
- Digitally Controlled Oscillator Capacitance Grouping for Fine Tuning
Grouped frequency tracking capacitors improve DCO tuning resolution and range while limiting mismatch, parasitics, and phase error.
- Adaptive OTA Output Stage Sizing for Variable Capacitive Loads
Selective parallel output transistors let an OTA buffer match changing capacitive loads, preserving reference voltage, stability, and settling.
- Phase Interpolator Circuit for Precise Clock Edge Alignment
Low-pass filtering and multiplier-based phase shifting align clock edges within shrinking sampling windows for accurate high-data-rate sampling.
- Adaptive Continuous-Time Filter Tuning With Digital PLL Control
A digital PLL measures RC time constants and drives switched networks to keep RF receiver filter cutoff stable across process and temperature shifts.
- Single-Tone Transmitter Calibration for Carrier Leakage and IQ Imbalance
Uses single-tone and DC test signals with power feedback to calibrate carrier leakage and IQ imbalance in transmitter paths.
- Silicon MEMS BPSK Modulator Using 180° Phase Resonator Outputs
A silicon MEMS resonator generates two 180° out-of-phase signals, simplifying BPSK modulation while reducing distortion and amplitude loss.
- Inductive Coupling Structure for Clock Signal Synchronization
Magnetic coupling synchronizes distributed oscillators, eliminating clock trees to reduce power consumption and voltage drops.
- Integrated Filter-VCO Tuning for Area Reduction
A filter portion configured as a VCO circuit enables center frequency tuning without external oscillators.
- MEMS Device with Dual Thermal-Electrostatic Out-of-Plane Actuation
Dual thermal and electrostatic actuators drive a movable plate out of plane, enabling wide tuning ranges and high Q factors for RF filters.
- Inductor Closed Ring Magnetic Coupling Q Factor
Conductive closed rings magnetically couple to inductors to lower the quality factor and enable wider bandwidth without generating excess heat.
- Variable Capacitance Unit for Ultra-Fine Frequency Resolution
Segmenting parallel varactors reduces capacitance difference below 1 attofarad, resolving the trade-off between measurement precision and device complexity.
- Multi-Varactor VCO Gain Stabilization via Segmented Biasing
A multi-stage varactor circuit segments tuning elements across distinct bias voltages to linearize capacitance response and maintain constant gain.