Dc Amplifiers With Modulator-Demodulator TRIZ Cases

Mode detection switches OCP current limits between ternary and quaternary operation to prevent overcurrent without sacrificing Q-mode capability.

Dual startup reference ramps let a Class-D amplifier raise PWM duty cycle smoothly and suppress speaker pop without added circuit complexity.

By varying PWM frequency with input signal distribution, this audio amplifier cuts low-power switching loss and sustains efficiency.

A replica amplifier senses shoot-through duration to set dead time accurately, cutting Class D cross current without adding harmonic distortion.

Feedback control of H-bridge common-mode voltage and current cuts signal corruption in three-state filterless switching amplifiers.

Short PWM pulses can distort digital amplifier output; this case uses MLP and compensating signals to preserve linearity and sound quality.

A modulated reference path prevents loop saturation in closed-loop class-D amplifiers, improving supply noise rejection and THD+N under battery voltage swings.

Dynamic Buck and charge-pump rail tracking cuts headphone amplifier power loss while avoiding interference from discontinuous switching.

Using three supply voltages and pulse-density modulation, this amplifier expands boost output range while reducing EMI, stress, and quantization error.

A timing circuit measures output-stage turn-on delay and pre-compensates input pulses to preserve pulse width and dynamic range.

Input signal detection stops switching when audio is absent, cutting idle power loss while preserving amplifier response and signal quality.

Internal PWM and oscillator clock signals detect class-D amplifier clipping, cutting distortion and speaker stress without added circuit overhead.

A 25% duty-cycle local oscillator with a combined transconductance mixer cuts current and noise while preserving signal-to-noise ratio.

A reference-tracking feedback loop adjusts PWM edge timing in a class-D amplifier to cut distortion from switching delays and rise-fall errors.

Selective driver enabling and free-fly intervals cut class D RF amplifier switching losses while improving drain efficiency at lower power levels.

Gradual PWM duty shifting to low state mutes digital audio without abrupt switching, reducing pop noise and unnecessary radiation.

A pre-modulation stage adds double sampling and carrier-frequency notches to cut ripple and distortion without high-order output filters.

Gradually changing PWM pulse widths and intervals suppresses D-class amplifier popping noise during start-up and shut-down.

Cycle-by-cycle pulse selection and feedback compensate PWM distortion and power-supply noise in a half-bridge class-D audio amplifier.

A dual feedback loop corrects effective duty ratio errors in Class-D audio amplifiers to suppress power-stage distortion and supply noise.

Dynamic feedback-path switching suppresses mismatch errors in sigma-delta amplifiers, improving efficiency and removing bulky LC filters.

Feedback-driven third-state selection in an H-bridge reduces common-mode voltage and current variation to protect signal integrity with less circuitry.

Fractional up-sampling and programmable sigma-delta PWM reduce spurious tones, noise, and clock sensitivity in Class D audio output.

Instantaneous per-pulse feedback corrects switching and supply errors in a Class D PWM power stage, cutting heat, distortion, and EMI.

Oversampling and split control signals let a power amplifier keep high PWM resolution without raising PWM frequency, reducing cost and complexity.

A Class D stage paired with a biased linear output stage cuts ripple and distortion while preserving amplifier efficiency.

A simple linear PWM modulator keeps audio digital while amplifier feedback suppresses noise without costly A/D conversion.