Angle Modulation By Variable Impedence TRIZ Cases

Loop filter based indicator circuitry aligns high-pass and low-pass PLL paths to cut distortion and simplify polar transmitter calibration.

Switchable polyphase resistors and a constant Gm(R) bias keep wideband single-sideband conversion stable across PVT variations.

A differential oscillator uses segmented capacitor arrays for coarse and fine resonant-frequency tuning, improving modulation precision and noise resistance.

Two control inputs separate center-frequency tuning from linear modulation, improving millimeter-wave radar sensitivity without external compensation.

Loop-filter-based performance indication decouples PLL phase-path calibration from amplitude interactions, cutting distortion and calibration time.

Switched capacitor groups and low-pass filtering linearize clock phase modulation while holding amplitude steady and reducing noise floor.

A control circuit compares output and reference clocks to correct CMOS oscillator drift from temperature and voltage changes.

An external LC tank antenna provides a resonance reference to trim an internal RC oscillator without crystals or micro-controllers, cutting power and cost.

A high-order and first-order delta-sigma chain replaces a DAC to improve DCO frequency resolution, suppress jitter, and resist supply variation.

A high-power VCO generates the FSK RF signal at the antenna, removing driver and mixer stages to cut transmitter SWAP-C.

By injecting a delta-like frequency variation, the PLL calibrates VCO gain online from phase error without leaving closed-loop operation.

A dual-LC transformer resonator switches odd and even modes to extend VCO tuning range while limiting phase noise, power loss, and chip area.

Temperature sensing and compensation varactors stabilize VCO frequency drift and phase noise across wide thermal changes.

Discrete switchable capacitors in an LC tank let oscillators shift frequency in precise steps while minimizing interference in wireless signals.

A switched varactor circuit uses HBT-controlled varactors to widen VCO frequency range while maintaining accuracy across process, voltage, and temperature shifts.

Using transformer mutual inductance and selectable oscillation loops, this case expands multiband frequency output while preserving phase noise.

Digitally switched varactor sections stabilize wideband VCO frequency over temperature without adding compensation capacitance.

A time-constant control signal drives a second variable-capacitance group to limit startup frequency drift in quartz crystal oscillators.

A switched-capacitor VCO and bang-bang feedback loop cut PLL settling time while improving phase noise and lock stability.

Tail node voltage monitoring calibrates VCO amplitude to preserve tuning range while maintaining noise resilience in PLL oscillators.

Segmented varactors and switchable active elements keep VCO tuning gain stable across wide frequency bands while reducing power waste.

A dual-control varactor network shifts VCO center frequency while keeping capacitance ratio and gain stable for PLL and CDR loops.

Integrated diode-resistor compensation linearizes VCO frequency sweep for radar sensing, improving target discrimination without external loops.

Slow varactor-pair adjustment keeps a multi-band VCO in its linear tuning range, correcting temperature and crystal drift while limiting jitter.

A resistive-capacitive divider limits thin-oxide transistor stress in differential Colpitts VCOs while preserving output swing and phase noise.

A flicker-noise reducing switch selectively adds capacitance in an LC tank to limit parasitics and widen oscillator tuning range.

Shared-bias VCO and divider integration cuts power use while magnetically coupled inductors and gate capacitance reduce near- and far-offset phase noise.

Digital varactor arrays tune ring oscillators with wider frequency control, lower noise sensitivity, and better process migration than analog VCOs.

An analog low-pass filter between sigma-delta modulation and the DCO cuts fractional spurs and improves PLL phase noise.

A second varactor in the amplifier makes complex resistance frequency-dependent, widening oscillator tuning while lowering phase noise.

Dual-bank and fractional tuning reduce tuning elements while improving LC-tank oscillator frequency resolution, range, and area use.

A passive impedance network biases the switching path to tune resonant frequency while cutting thermal and switch noise in LC oscillators.

Multiple series resonators spread varactor RF voltage and cut parasitics, widening VCO tuning bandwidth while flattening phase noise.

A controller switches from single to back-to-back inverting amplifiers to improve oscillation balance, phase noise, and startup stability.

Switching capacitor banks between clock and phase-shifted inputs enables efficient high-bandwidth phase modulation with improved noise performance.

Variable impedance trimming with amplitude feedback tunes resonant frequency automatically, reducing mismatch from tolerances and temperature shifts.

Shielded control lines in an LC digitally controlled oscillator cut parasitic capacitance variation and lower DNL for more precise frequency tuning.

Fractional capacitor units replace sigma-delta control to improve oscillation frequency resolution while cutting out-of-band noise, power, and area.

Separating FM modulation and temperature correction in a VCO keeps frequency sweep linear across temperatures and cuts radar tuning time.

Separating the stabilizing circuit from the voltage modulation path suppresses parasitic oscillation without filtering ultrahigh-speed signals.

Opposed varactor C-V curves and capacitive dividers stabilize VCO tuning, cut phase noise, and protect thin oxide switches from breakdown.

Two varactors and a fixed capacitor split VCO tuning into coarse and fine control, widening frequency range with lower control voltage.

A dual-VCO matching circuit reuses current and integrates frequency division to cut RF power draw while keeping tuning range and phase noise stable.

Differential transformers reuse transistor current to raise LC oscillator output swing while varactor tuning helps cut phase noise and power.

A series resistance matched to inductor temperature behavior stabilizes LC oscillator frequency despite large parasitic capacitance.

A varactor-based temperature compensation circuit stabilizes VCO frequency across thermal changes, reducing drift and jitter.

A passive CMOS divider uses MOS-varactor parametric resonance to halve high-frequency signals with zero DC power and lower phase noise.

Measured resonance frequency guides capacitance and power adjustment to widen MEMS oscillator tuning range with lower power use.

Cross-coupled negative impedance compensation offsets supply-driven delay-cell changes, cutting VCO jitter without extra regulators.

An integrator-driven auxiliary control path compensates oscillator temperature drift while preserving low phase noise in wireless handsets.

Distributed varactors and inductive transmission lines raise resonator Q, cutting phase noise while preserving tuned VCO power output.

Adjusting tank common-mode voltage keeps MOS tuning switches in inversion during frequency tuning, reducing LC oscillator phase noise.

AC-coupled back-to-back MOS varactors enable precise resonant frequency tuning while limiting nonlinearity, load imbalance, and power dissipation.

A nonlinear capacitor and switched capacitor bank let an RFID resonator self-tune to detuning, preserving high Q and reliable power-up.

Segmented MSB, LSB, and sigma-delta varactor banks with pre-distortion calibration extend RF DCO tuning range and improve modulation resolution.

A dual-input VCO filters the frequency-selection voltage inside the PLL, cutting filter complexity and noise without slowing loop dynamics.

Discrete switched capacitors create a non-linear load that compensates crystal oscillator tuning non-linearity for more linear frequency control.

Parasitic capacitance is repurposed as a bypass path in a piezoelectric oscillator to widen frequency tuning and support IC integration.

Additional oscillator tanks and feedback tuning cut drain noise in an LC VCO, improving phase noise beyond tank Q limits.

Two coupled VCOs share current through passive coupling to cut phase noise by about 3 dB without raising power dissipation.

Closed-loop varactor tuning holds crystal reference frequency steady despite temperature drift and manufacturing variation.

Selective varactor switching with different sensitivity ratios keeps VCO gain stable across multiple frequency bands while reducing circuit size.

A passive charge pump and varactor path corrects PLL phase errors at high data rates without digital pre-emphasis or complex calibration.

Reactive capacitance is tuned in a compensating ratio to control oscillator frequency without abrupt changes in steady-state signal magnitude.

A differential VCO uses transformers and a secondary-side matching circuit to deliver large signal power at preset impedance with low power use.

An analog comparator and digital VCO load switching let one PLL lock across wide HDMI frequencies while cutting die area and power.