Angle Modulation By Variable Impedence TRIZ Cases
- Thermometer-Coded DCXO Circuit for Monotonic Crystal Tuning
Thermometer-coded switched-capacitor tuning replaces DAC control in a DCXO to deliver monotonic crystal frequency adjustment with wide range.
- VCO Modulation Circuit with Temperature Drift Compensation
Separating temperature correction from FM modulation keeps VCO frequency in range while preserving modulation linearity and reducing adjustment time.
- Dual-Tuned VCO Circuit for Wide Range and Low Jitter
Switchable and continuously adjustable varactors widen VCO tuning range while keeping gain stable to reduce PLL noise and output jitter.
- Piezoelectric VCO Capacitance Control for Linear Wide-Range Tuning
Two voltage-controlled capacitors and an analog control circuit linearize load capacitance while widening piezoelectric VCO tuning range.
- Digital Controlled Oscillator Capacitor Arrays for Linear Wide-Range Tuning
Multiple capacitor arrays with integer-scaled capacitance steps enable wide linear frequency tuning while reducing area and parasitic capacitance.
- Dual-Control VCO Circuit for Wideband Multi-Band Tuning
A second control terminal shifts VCO center frequency through transistor characteristics, enabling simple wideband multi-band tuning.
- Binary-Weighted Varactor Control for VCO Gain and Phase Noise
Digital control disables binary-weighted varactors to stabilize VCO gain across frequency range and reduce phase noise in PLLs.
- Dual-Bias Varactor VCO for Wide-Range Temperature Compensation
Separate biasing at both varactor terminals enables wide-range temperature compensation and stable oscillation frequency at high frequencies.
- Multi-Tap LC Oscillator for Wide RF Tuning Without Extra Parasitics
A multi-tap inductor extends RF LC oscillator tuning range without extra parasitic capacitance, reducing core count, area, and design cost.
- Multi-Mode Digitally Controlled Oscillator for Step Size Trade-Offs
Switchable capacitance lets one DCO balance fine frequency resolution, modulation bandwidth, and phase noise across GSM and UMTS.
- Differential Wideband Mixer With Peaking Network for Stable Gain
A bandwidth peaking network extends a differential mixer beyond 20 GHz while preserving gain and enabling low-voltage IC operation.
- T-Network Capacitor Bank for Fine VCO Capacitance Resolution
Using T-network capacitor cells with larger MIM capacitors, this case achieves fine VCO capacitance steps while reducing variation from manufacturing.
- PLL Frequency Synthesizer Tuning with Reference Potential Control
A two-step VCO tuning approach applies a reference potential to the variable capacitor to reach lock frequency more reliably despite capacitor variation.
- VCO Temperature Compensation Without PLL Phase Noise Penalty
A temperature-dependent tuning voltage is applied only during coarse calibration, limiting VCO drift while preserving PLL lock and phase noise.
- Switchable Degeneration Impedance Circuit for Multi-Band Oscillators
Switched capacitor branches vary degeneration impedance to cut noise and extend VCO and divider circuits across multiple frequency bands.
- Dielectric Resonator DC-Cut Electrode Pattern
A dielectric resonator integrates a surface electrode gap to provide magnetic-field coupling for DC blocking.
- Dual Mode Tuning Digitally Controlled Crystal Oscillator
A dual mode tuning digitally controlled crystal oscillator integrates coarse and fine frequency compensation units to adjust oscillation signals.