Pulse Automatic Control TRIZ Cases

A time-average digital CDR uses binary phase detection and a DCO to track frequency offsets while reducing jitter, noise, and power.

A voltage-reducing I/O circuit keeps protection active against external high voltage even when the chip core voltage is off.

Edge-data phase detection lets one edge clock and fewer data clocks recover data accurately while cutting circuit area and power.

Alternating switched-capacitor phases in a PLL loop filter cut flicker noise and power use while preserving chip area efficiency.

Dual tuning signals and AFC let mechanical resonator oscillators match target frequencies, easing manufacturing limits while keeping circuits stable.

Level compensation and PMOS switching stabilize ALS node voltages, reducing leakage and voltage drop in LCD driver circuits.

A supply detector and failsafe circuit deactivate IO drivers during power transitions to prevent leakage and keep PAD current ultra low.

An internal LC oscillator and programmable divider replace the external master clock to keep multi-stream audio sample rates stable and glitch-free.

Shared oscillator bias is corrected using wireless and SPS-derived parameters to shrink satellite search space and speed position fixes.

Temperature sensing adjusts the divider ratio and calibration element to keep crystal oscillator clock accuracy stable across temperature changes.

Using supply-derived reference and feedback voltages, this oscillator stabilizes clock frequency against temperature and supply drift with low area and power.

A period-limited sync circuit tracks VSYNC frequency changes smoothly, stabilizing backlight clocks and preventing LCD flicker.

An open-loop DLL uses coded delay pulses and a divided clock to cut locking time, lower current draw, and improve noise robustness.

A delayed second-clock adjustment scheme cuts unnecessary phase shifts, reducing jitter and improving link performance and bit error rates.

Bias-controlled delay and mixed clock paths counter power-supply-induced jitter, preserving timing and synchronization in memory devices.

A retained level shifter holds interface states across voltage domains during controller power-down, cutting SoC power use and signal noise.

Extended phase-frequency detector pulses speed PLL phase lock during power-up, then switch back to normal gain to limit power use.

A phase- and frequency-controlled clock recovery circuit raises internal clock speed while keeping external clock edges aligned for reliable data transfer.

A latch-controlled pass transistor pre-charges a pad, prevents floating input states, and cuts power and loading during normal operation.

Sampling pulses and counter-controlled charge pumping cut PLL variation, power use, and circuit scale in on-chip loop filter integration.

A trigger samples delay-line selection signals on the delayed clock so DPLL updates track PVT changes without glitching sensitive circuits.

A state flip-flop doubles as the final synchronizer stage to cut clock-domain latency, logic, and power while preserving reliable control-signal transfer.

Stored lock-state restoration lets a frequency locked loop relock within one or two reference cycles after re-enablement, cutting delay and power use.

Three phase detectors let a DLL distinguish jitter from true phase error, enabling stable coarse-to-fine clock synchronization.

An AFL circuit compares reference and strobe phases to prevent harmonic or stuck locks and keep DLL strobe timing accurate.

Control pulses switch panel data lines to a reset voltage and isolate unstable driver outputs during power-on and power-off, preventing noise-like images.

A slave-side PLL extracts a bit pattern from CAN frames to recover bus clock timing, cutting quartz oscillator cost and power use.

Switchable PLL topology connects analog or hybrid digital blocks to balance phase precision, circuit complexity, and power use.

An asynchronous counter and time-to-digital converter estimate coarse and fine clock timing error for digital PLLs while reducing spurs.

Additional pull-up paths speed voltage level shifting during transitions while keeping standby current and power dissipation low.

Orthogonal detection and vector feedback enable fine wideband frequency setting with stable entrainment and lower noise from simpler PLL circuitry.

Multiple sampling phases are checked by CRC so the receiver can lock onto the best strobe offset and preserve frame integrity on distorted buses.

Run-length detection dynamically adjusts CDR loop bandwidth to balance fast settling and low jitter across changing input data frequencies.

A clock bus generates a third clock from multiple circuit blocks to align sampling timing and prevent high-frequency data errors.

By varying effective resistance with control-signal pulses, this PLL loop filter reduces capacitor area, 1/f noise, and lock time.

A digital accumulator replaces sigma-delta modulation in a fractional PLL to cut quantization noise, spurs, power, and circuit complexity.

A mixer-based phase detector and V-to-I control enable full-rate clock recovery with linear behavior and lower phase noise.

Segmented fixed and variable delay stages cut shift registers and selection signals, reducing power while preserving flexible latency control.

A gradually narrowing coarse-tune filter lets the PLL lock quickly at startup, then refine frequency and phase with higher stability.

Threshold-based frequency adjustment lets a digital PLL lock quickly at high frequency while limiting jitter during steady-state synchronization.

Dynamic gain scaling uses target speed to preserve true signal peaks, boost low-speed SNR, and avoid high-speed clipping.

A frequency-detected replica delay extends DLL operation at low frequencies while limiting area, current consumption, and jitter.

Selective delay-cell activation extends DLL locking range while cutting current draw in semiconductor memory clock generation.

A two-stage duty correction block stabilizes input and output clock duty ratios in DLLs, limiting high-frequency skew and distortion.

An initial divided supply voltage precharges the DLL delay control path, preventing startup phase errors and stabilizing clock synchronization.

A voltage-controlled data eye monitor tracks drift from temperature and supply changes to keep sampling clocks aligned for accurate data capture.

A modified DLL charge pump keeps non-overlap timing stable across clock changes while cutting amplifier current and ADC power.

Constant-clock DLL coding and glitchless clock switching avoid re-lock delays and memory corruption during DVFS transitions.

A buffered local clock network with a shorting bar cuts wire RC skew and delay, improving clock matching and slew across branches.

A phased switch from a static PLL clock to a programmable spread-spectrum clock cuts wireless interference without losing lock.

A control circuit drives capacitor charge and discharge to precisely set triangle-wave amplitude, frequency, phase, and symmetry for cleaner PWM output.

Coarse and fine delay lines with FSM control keep DDR timing signals aligned while reducing jitter and analog circuit complexity.

A cascaded CMOS limiting amplifier uses DC offset cancellation and feedback filtering to raise gain and bandwidth while reducing power.

An initialization switch and start-up current keep a PLL out of high-impedance deadlock, enabling stable startup and restart under noise.

Bias feedback adjusts the VCO control-voltage ratio to preserve PLL frequency range under process, voltage, and temperature variation.

Stored weight selection keeps DLL phase mixing at a stable 50:50 duty ratio despite noise, PVT variation, and power-down cycles.

Variable-width up and down pulses preserve phase correction at high frequencies, improving PLL accuracy in data and clock recovery.

A DSP-based DTPLL replaces complex mixed-signal PLL hardware to enable variable frequency ratios with accurate, stable clock generation.

A delay compensation unit shifts capacitor comparison levels to offset comparator and latch delay and keep oscillator frequency stable.

A three-PLL LO scheme separates transmit and receive paths to speed frequency switching while keeping stable operation across wireless standards.

Capacitive coupling and transition detection let a receiver handle mixed-voltage signals with low static current and no extra level shifters.

Timed detection of phase-signal voltage changes lets a DLL avoid jitter-driven update errors while reducing unnecessary current use.

Multiple phase-difference ranges let a DLL hold lock through clock jitter, avoiding false lock-loss switching and unstable internal clocks.

A control circuit suppresses racing and leakage in a level shifter, cutting propagation delay and power use without creating an ESD path.

Using differential fine-delay cells and inverter coarse-delay cells, this DLL lowers power and jitter while tolerating PVT variation.

Adjusting the common-mode level difference keeps MOS differential-mode resistance more linear, improving filters, amplifiers, and signal selection.

A two-stage level shifter uses differential intermediate signals to expand 0V-1.4V inputs to 0V-5V with faster response, lower power, and less area.

Energy estimation filters or weights low-energy phase samples, improving PLL lock accuracy and noise robustness in noisy QAM signals.

A non-integer LO ratio with digital phase mixing suppresses RF frequency pulling and eases filtering in wideband transceivers.

A current-based POR circuit compares quadratic and logarithmic currents to set a precise reset threshold with better noise tolerance.

Calibrating TDC, DCO, and proportional-path gain in an ADPLL improves loop bandwidth accuracy while reducing error propagation and switching noise.

Cross-coupled control uses the higher port voltage to hold a level-translator pass switch off even when the supply drops to zero.

A dual-voltage PLL filter uses thick-oxide MOS transistors and level shifters to cut leakage current and reduce clock jitter.

Controlled capacitor discharge during interpulse periods cuts dynamic offset from asymmetric signal strings and protects downstream processing.

Negative-feedback delay control measures and corrects clock phase spacing so rising edges stay equidistant in high-speed interconnects.

A controllable delay, low-pass filter, and comparator stabilize doubled clock output and correct duty cycle across process, voltage, and temperature shifts.

Parallel low-resolution DAC coding replaces a high-speed multi-bit DAC in clock recovery, reducing analog summing complexity and phase-error delay.

An on-chip phase step generator inserts a clock phase shift so PLL bandwidth can be measured accurately without a programmable tester.

A recorded modulation profile separates periodic frequency shifts from phase noise, enabling stable clock recovery at high data rates.

Delaying clock buffer shutdown until phase update completion keeps SDRAM DLL synchronization stable during power-down entry.

A frame-clock-referenced PLL uses a sample-reset loop filter and feed-forward integration to achieve low bandwidth with on-chip capacitors.

Pausing the clock during reset synchronizes multiple flip-flops, preventing timing errors and avoiding extra buffer cost and size.

DLL and mock delay blocks align write and system clocks under PVT variation, keeping memory write data and address timing matched.

A coarse and fine DLL loop synchronizes multi-phase memory clocks under supply voltage changes while reducing phase error, jitter, and power.

A single low-frequency test clock drives ring oscillation to verify DLL delay generation without dual phase-shifted clock lines.

A common-rate clock recovery scheme lets optical Ethernet carry synchronous TDM traffic with lower jitter and wander.

Dynamic load capacitors and startup bias control cut crystal oscillator startup time and energy use while preserving stable oscillation.

Open-loop VCO calibration with gated PFD control shortens fractional-N PLL settling while limiting quantization noise and phase noise.

A latch-based level shifter keeps output state valid across supply-domain power-down and prevents crowbar current when the source rail drops to zero.

An integrated time-base synchronizes multiple variable-frequency power converters across wide limits, improving phase alignment and restart stability.

A single coarse delay line and phase mixer keep DLL phase transitions smooth and output clocks jitter-free at high frequencies.

Controllable capacitor load sections with temperature compensation tune VCO delay stages while reducing phase jitter and frequency drift.

A single adjustable POR circuit detects multiple voltage trip levels, cutting IC area and simplifying calibration for internal reset timing.

Behavioral HDL modeling separates PLL and random-number noise sources, cutting spur and phase-noise tuning time before tape-out.

Samples and compares delayed clock phases to choose the right delay stage in real time, keeping clock timing stable under PVT variation.

High-order delta-sigma interpolation pushes DDS phase and amplitude quantization noise out of band, reducing spurs and close-in phase noise.

A controlled adjustment voltage and resistor remove op-amp output offset while preserving adjustment accuracy and range as gain changes.

Switched CMOS inverters in a ring oscillator divide the reference clock into an LO signal with lower power draw and less supply noise.

Two parallel DLLs lock the system clock and its inverse, then select the faster clock to cut locking time and avoid stuck states.

Voltage-tuned capacitor delay in a DLL corrects output clock duty cycle while cutting digital DCC area, power use, and high-speed complexity.

Using an asymmetric triangular modulation profile, this case spreads clock power more uniformly to improve peak attenuation and reduce EMI.

A dual-regulator PLL/DLL circuit filters power supply noise while preserving phase and frequency lock, reducing output jitter.

Switch-based integration of voltage level shifting and data latching cuts source driver chip layout area and helps lower fabrication cost.

An RC oscillator plus period detection and fractional PLL keeps a smart card clock within USB full-speed limits for stable data transfer.

A fractional-divider PLL with filtering and quantization spreads clock energy to cut EMI 20-30 dB while avoiding phase jumps and jitter.

A control circuit and adjustment unit let a pull-up stage tolerate I/O voltages above supply level while preventing transistor damage and noise.

Identical level-shifting paths and complementary inverter buffers keep output phases aligned across voltage and process variations.

Timed charge-up and charge-down switching cuts DLL power use while preserving accurate phase shifting without a master PLL.