11 results about "Class-D amplifier" patented technology

An audio amplifier that implements current mode control without the use of an explicit or separate current mode sensor is disclosed. The audio amplifier may include a pair of feedback loops that provide current from a node located before an inductor of an output filter and current from a node located after the inductor of the output filter to an integrator circuit. The integrator circuit may be formed from existing circuitry of the audio amplifier controller. Thus, current mode control can be implemented without a separate current mode sensor. Further, the audio amplifier can be implemented as a half bridge or as a full bridge design without increasing the number of operational amplifiers compared to the half bridge.

An input signal may be converted to a first PWM signal and a second PWM signal at a PWM controller circuit. The first PWM signal and the second signal output may drive a driver circuit. The driver circuit may receive a high voltage power supply from a boost converter or other power supply circuit. The driver circuit may include a high side device and a low side device. The output of the driver circuit may drive a filter circuit that includes a filter capacitor, an inductor, and a haptic actuator. The haptic actuator may generate a desired haptic response at the haptic actuator.

A class D amplifier including a pulse width modulation (PWM) control loop, an H-bridge driver, a PWM controller having a PWM pulse generator to generate PWM pulses supplied to the H-bridge driver in response to an ADC value output by an analog-to-digital converter of the PWM control loop, and a comparator. The comparator is configured to trigger a cutoff of a PWM pulse generated by the PWM pulse generator during a respective loop cycle of the PWM control loop and to trigger generation of at least one counter PWM pulse with an opposite polarity in the respective loop cycle such that a net pulse energy of the cutoff PWM pulse and of the at least one generated counter PWM pulse corresponds to a pulse energy representing the ADC value provided by the analog-to-digital converter of the PWM control loop during the respective loop cycle.

The invention relates to a self-biased low-harmonic high-efficiency inverse class-D RF power amplifier circuitry. Power amplifier circuitry is disclosed having an inverse class D amplifier acting as a power amplifier and self-biasing circuitry that generates a gate bias voltage for a switched-mode power transistor within the power amplifier. The self-biasing circuitry includes a low dropout regulator that generates and applies a gate bias voltage in response to a feedback current scaled according to an operating current of the power amplifier. The current-based digital-to-analog converter is configured to generate a reference current based on the received digital value. In addition, a digital processor is configured to generate the digital value in response to the gate bias voltage. The power amplifier circuitry enhances performance and efficiency while ensuring precise control of power transistor operation, providing advantages for various applications requiring radio frequency signal amplification.

The present application relates to a class-D amplifier. The class-D amplifier includes a loop filter configured to receive first and second feedback signals, and receive first and second input signals through first and second resistors, respectively, and filter the first and second input signals and the first and second feedback signals to generate first and second filtered signals; a triangle wave generator configured to generate a triangle wave based on first and second reference voltages; first and second comparators configured to compare the first and second filtered signals to the triangle wave to generate first and second pulse width modulation signals, respectively; first and second driver circuits configured to generate first and second output signals based on the first and second pulse width modulation signals, respectively; and a reference voltage generator circuit configured to generate the first and second reference voltages based on a control signal.

This invention provides a CMOS ultra-wideband high-gain high-power amplifier, relating to the field of power amplifier technology. It includes a multi-drive improved Class D amplifier and a multi-stage compact coupled peaking distributed amplifier. The multi-stage compact coupled peaking distributed amplifiers are connected sequentially. The input RF signal is connected to the first-stage compact coupled peaking distributed amplifier via an input line. The output of the Nth-stage compact coupled peaking distributed amplifier is connected to the input of the multi-drive improved Class D amplifier via an output line. The output of the multi-drive improved Class D amplifier outputs the RF signal. The advantage of this invention is that it solves the problems of large area, low gain, and low output power in traditional distributed amplifiers.

This application discloses a sine wave generation circuit and an electronic device. The sine wave generation circuit includes a first signal conversion module, a Class D amplifier, a second signal conversion module, and a voltage control module. The first signal conversion module converts a square wave signal into a first sine wave signal with adjustable amplitude. The Class D amplifier amplifies and modulates the power of the first sine wave signal, and then outputs a high-frequency carrier pulse-width modulated signal. The second signal conversion module demodulates and boosts the high-frequency carrier pulse-width modulated signal to output a second sine wave signal. The voltage control module outputs an adjustment signal to the first signal conversion module to adjust the amplitude of the first sine wave signal based on the control signal and the second sine wave signal until the voltages of the control signal and the second sine wave signal satisfy a preset relationship. This method allows for the output of a corresponding sine wave signal according to user needs, and is highly reliable due to its high conversion efficiency.

A method includes determining whether an audio signal processed in a class D amplifier is clipping (404). In response to clipping of the audio signal, a speaker voltage is estimated as a ratio of a supply voltage of the class D amplifier to a resistance of a speaker driven by the class D amplifier (408). An amplitude of the audio signal is controlled based on the speaker voltage.

This application relates to sensing of signals with a variable common-mode component, e.g. at the output of a class D amplifier. Embodiments describe a switching driver circuit with a modulator (601,

One method involves determining whether clipping is present in an audio signal processed by a Class-D amplifier. In response to clipping, a speaker voltage is estimated as the ratio of the Class-D amplifier's power supply voltage to the resistance of a speaker driven by the Class-D amplifier. The amplitude of the audio signal is then controlled based on this speaker voltage.