Negative-Feedback-Circuit Arrangements TRIZ Cases

A feedback circuit boosts or deboosts source degeneration inductance to improve amplifier input matching, gain, and wideband consistency.

Exponential capacitor segments let digitally controlled amplifier filters tune cutoff frequency linearly on a log scale with better high-band accuracy.

A series sensor and feedback capacitor topology uses controlled feedback to limit parasitic attenuation and improve low-noise capacitive readout.

A shunt-feedback and output-capacitor LNA extends gain bandwidth while preserving wideband input matching and low noise.

Current mirrors and feedback hold bias and idle current in MOS audio output stages, improving linearity and frequency response.

Switchable resistor arrays and feedback loops suppress out-of-band noise while preserving linearity in a SAW-less multi-band transmitter.

Delayed dissipative feedback in a CMOS shaper cuts noise power and extends dynamic range without requiring larger capacitance or area.

Digital control of a monolithic gain element replaces external resistors, enabling precise amplification with low drift across temperature and input voltage.

Switched-capacitor high-pass filtering rejects amplifier offset across PGA gain changes, cutting current draw in portable audio.

A control portion adds input and power-supply exception handling to op-amp macro models, improving simulation realism without heavy analog load.

Mutually coupled class F inductors tune RF PA impedance across bands and modes, cutting size, cost, and power use.

Phase-shifted comparators create three-level PWM with shared feedback to cut distortion and power loss in filterless Class-D amplifiers.

A two-stage TIVA boosts weak MEMS resonator current while cutting flicker noise, power use, and chip area for better phase noise.

A nonlinear resistor feedback circuit varies gain with signal amplitude, expanding differential amplifier dynamic range while limiting distortion.

A pre-capacitor feedback path with source followers stabilizes TIA bias and extends low-frequency response for CMOS photonic receivers.

Current-limited input protection and cascaded variable gain help oscilloscope front ends withstand overloads without degrading bandwidth or noise.

Variable feedback keeps VGA gain adjustable while holding input/output impedance steady and preserving low noise figure and output IP3.

Parallel linear and switch-mode current loops cut output-stage heat while preserving precise fixed-current control and low ripple.

A current source in the feedback resistor network cancels DC offset while preserving adjustable amplifier gain across temperature and process variation.

Switched-capacitor high-pass filtering blocks offset voltages in an integrated audio amplifier while preserving bandwidth across gain settings.

Blended bias, amplitude, and outphasing control improves RF amplifier linearity and efficiency without lossy isolating and combining elements.

Dynamic bias control raises transistor current only under strong disturbing waves, preserving LNA sensitivity while limiting power use.

Multiple amplification units, feedback loops, and a synchronous rectifier let one audio amplifier handle separate, parallel, or bridge-tied loads efficiently.

A compensating feedback block linearizes AGC-to-output power control in switched PA modules, easing calibration and temperature compensation.

A cancellation circuit restores harmonics during the free-fly interval to cut switching losses and raise class D PA efficiency.

Capacitive current division in a T-shaped feedback network cuts noise current while preserving wide bandwidth in photodetector amplifiers.

A feedback loop adjusts transmitter PA supply voltage from pre-amp output to hold constant compression, reducing power loss and signal artifacts.

A single LNA reuses components to switch between inductive degeneration and resistive feedback, improving noise figure with fewer external parts.

A sampled capacitor stores amplifier input offset and cancels it in the feedback path, improving differential reference accuracy for precision ADCs.

Symmetric bidirectional feedback and current division create high on-chip resistance with better linearity, wider voltage swing, and less area.

Offset-based PWM duty adjustment cuts static current at low audio levels, improving amplifier power efficiency after filtering.

A feedback transistor with on-chip RC feedback lowers common-gate input resistance to 50Ω while keeping broadband gain, low noise, and low power.

Adaptive bias power tracking and dual-feed distribution improve isolation, gain, and efficiency in N-way Doherty amplifiers at high output back-off.

Dual feedback paths with tuned capacitance and resistance reduce output noise while preserving corner frequency across a broader range.

Dynamic PMOS and NMOS clamping stabilizes sensor amplifier output limits while cutting current draw and reducing false fault diagnosis.

A dual charge pump and source follower totem pole cut class-D amplifier idle loss and avoid dead-time crossover distortion.

A down-converted noise path filters and subtracts transmitter noise at baseband, improving receiver sensitivity in compact wireless devices.

Down-converting transmitter RF to baseband and filtering noise cuts receiver coupling while avoiding external bandpass filters.

A normally off HBT amplifier boosts sub-nanosecond pulse voltage on-chip, avoiding bulky step-recovery diode hybrids for UWB driving.

Added high-frequency pole-zero tuning cuts noise amplification in closed-loop motor drivers while preserving phase margin and stability.

A parallel detector monitors gain control voltage and adjusts the setpoint to correct power amplifier loop saturation without losing dynamic range.

Timed control signals sequence amplifier switches to avoid short-through current while eliminating crossover distortion and improving efficiency.

A variable-impedance output circuit tracks PWM duty cycle to keep Class E switching amplifiers efficient across wide power ranges.

A pre-modulation block and double sampling suppress ripple and residual clock signals, improving switched-mode amplifier distortion without complex filters.

Timed sample-and-hold sensing captures class-D load current during low-side switching, avoiding series resistors and rail-swing interference.

By lowering voltage to the voltage amplifier when output drive is unnecessary, this case cuts idle power without stressing relay contacts.

Output-voltage feedback suppresses switching noise and loudspeaker-induced distortion in a compact switched-mode audio amplifier.

An RF pre-distorter adapts envelope-polynomial weights from output error feedback to speed PA linearization and improve spectral suppression.

A sampler in the DC feedback loop blocks carrier-frequency AC, cutting phase error while enabling smaller on-chip resistors.

An adjustment resistor keeps feedback behavior stable during gain changes, preserving phase characteristics and reducing signal distortion.