Negative-Feedback-Circuit Arrangements TRIZ Cases

Magnetic coupling between input and degeneration inductors adds negative feedback to improve LNA linearity without heavily degrading noise.

A parallel voltage clamping circuit keeps TIA output within a safe range during burst signals, preventing CMOS over-voltage damage.

Multiple feedback paths are selected by input signal type to prevent amplifier saturation and maintain stable, linear gain.

Dual compensation circuits reshape open-loop and feedback gain curves to suppress self-excited oscillation in deep-feedback FET power amplifiers.

MOS-switched resistor units enable precise resistance trimming with fewer resistors, cutting layout area and thermal noise in differential amplifiers.

A resistor-based common gain network and compensation loop suppress common-mode input signals while preserving stable opposite-polarity outputs.

Closed-loop sensing and reference comparison replace laser trimming to keep RF amplifier DC bias current accurate across temperature and power changes.

A compensated feedforward path keeps class-D amplifier transfer behavior consistent across open- and closed-loop modes while reducing ADC noise impact.

Transistor-based variable impedance replaces resistors in RF amplifier feedback, widening gain control while reducing circuit area.

Current feedback raises class-D amplifier output impedance to keep speaker Q in range, preserving low-frequency sound pressure with lower power use.

A feedback amplifier, rectifier, and holding capacitor keep output voltage constant to measure tiny capacitances with minimal parasitic influence.

Current detection feedback adjusts quiescent bias across amplifier stages to keep RF gain and output power stable under process and temperature shifts.

Separate offset tracking for each input transistor pair enables fast switching compensation, lower flicker noise, and less post-filtering.

A high-pass filter and feedback amplifier keep a multi-stage amplifier stable and gain-consistent as output impedance shifts from headphones to open load.

An RC network and op-amp feedback cancel input voltage variation, producing a stable output without increasing circuit size.

Dual feedback paths with AC coupling let the amplifier raise target-frequency gain while limiting noise and output saturation.

A reconfigurable RC filter lets an isolated amplifier drive single-ended or differential ADCs directly, cutting external circuitry, cost, and board space.

A T-coil and bridging capacitor hide parasitic capacitance, enabling higher feedback resistance for lower noise and wider TIA bandwidth.

Unilateral pre-embedding inductors cut large inductor requirements while staggered tuning boosts gain and widens terahertz amplifier bandwidth.

An integrated FET current-mirror bias circuit stabilizes RF amplifier quiescent current across PVT variation while improving linearity and stability.

An on-chip current-mirror termination provides DC gate biasing and broadband impedance, reducing resonances and improving gain flatness.

Negative voltage and current feedback virtually shape speaker impedance to flatten drive response and reduce current magnetostriction.

Passive nested Miller RC loops stabilize a three-stage single-ended amplifier while preserving bandwidth and lowering power use.

Tracks audio swing to adjust common-mode voltage in Class-D amplifiers, cutting static power use and inductor ripple losses.

Cross-coupled capacitors boost effective transconductance in a wireless LNA, raising gain while holding power, noise figure, and chip area down.

A low-pass filter plus switched-capacitor feedback resistor keeps amplifier high-pass corner frequency stable across temperature with low power.

Stable node voltages and common-mode feedback suppress startup spikes below 1 mV, preventing pop noise in class AB amplifiers.

Comparator-based monitoring detects oscillation in audio amplifier feedback loops, enabling control or shutdown to cut noise and excess current.

Comparator-based monitoring detects amplifier oscillation from feedback-loop and input-related signals, reducing noise and excess current draw.

A feedback-capacitor LNA removes off-chip input inductors while self-matching impedance, lowering noise figure and improving linearity.

Alternating calibration and amplification phases cancel input offset, keeping measurement current accurately proportional to power current.

A parallel feedback path with 180°+360°×n phase shift counteracts antenna load changes to stabilize RF output power and radiation power.

Pre-charging the amplifier output to a threshold voltage speeds offset calibration by reducing parasitic-capacitance transition delays.

A state-mapped tracker PMIC speeds PA mode transitions by expanding usable voltage states from a 2-bit digital interface.

Multiple positive and negative feedback loops raise amplifier gain and 3-dB bandwidth without reducing unity gain frequency.

A feedback and equalization circuit stabilizes inductorless amplifier gain across PVT variation while supporting operation beyond 16 GHz.

A tunable RC and op-amp circuit pre-compensates PMIC delay to align RF envelope and voltage signals, reducing PA amplitude distortion.

A resonant circuit creates low-impedance feedback for out-of-band noise while preserving gain at the target frequency, improving sensitivity and linearity.

A switchable feedback capacitor and resistor tap adjust amplifier compensation to preserve stability while widening bandwidth across gain settings.

Multiple RF detection paths with different gain levels improve transmit power sensing at low and high output levels while avoiding saturation.

Split cross-coupled capacitors raise differential gain-bandwidth while preserving common mode stability in two-stage differential amplifiers.

An isolation circuit blocks transient current during tracking, cutting settling time while avoiding higher power draw and excess kTC noise.

Dual current sources across a gain resistor cancel input offset, preserving dynamic range and preventing amplifier output rail saturation.

Configurable LNA feedback paths help carrier aggregation receivers preserve gain and noise performance across different antenna interfaces.

Multiple biased clipping paths segment TIA saturation so pulse width still encodes high-current amplitude for more accurate LiDAR ranging.

A current-domain LIDAR frontend separates DC and AC cancellation paths to improve noise, dynamic range, and recovery speed without clipping.

Comparing drive and feedback signals detects haptic loop instability, while negative impedance cuts ringing for crisper tactile clicks.

A switchable feedback path lets an RF amplifier support wideband and narrowband carrier aggregation while preserving gain, noise, and antenna interface compatibility.

By switching between regulated open-loop and direct-supply closed-loop modes, the circuit cuts noise, limits ADC area, and preserves THD+N.

Back-EMF sensing tracks speaker cone motion in real time to cut nonlinear distortion and extend excursion without bandwidth lag.