Systems and methods include a circuit having a plurality of integrator circuits arranged in series and configured to receive an input signal at a first of the plurality of integrators and generate an output signal at a last of the plurality of integrators, a filter arranged to receive a feedback signal comprising the output signal and generate a filtered feedback signal, which is applied to the input signal before input to the first of the plurality of integrators, and a feedback signal path configured to receive the feedback signal and apply the feedback signal to an input of a second of the plurality of integrators. The circuit may include a class-D amplifier and/or a delta-sigma modulator. The input signal may include an analog audio signal that is amplifier to drive an audio speaker.

Systems and methods are provided for amplifying multiple input signals to generate multiple output signals. An example system includes a first channel, a second channel, and a third channel. The first channel is configured to receive one or more first input signals, process information associated with the one or more first input signals and a first ramp signal, and generate one or more first output signals. The second channel is configured to receive one or more second input signals, process information associated with the one or more second input signals and a second ramp signal, and generate one or more second output signals. The first ramp signal corresponds to a first phase. The second ramp signal corresponds to a second phase. The first phase and the second phase are different.

Systems and methods are provided for amplifying multiple input signals to generate multiple output signals. An example system includes a first channel, a second channel, and a third channel. The first channel is configured to receive one or more first input signals, process information associated with the one or more first input signals and a first ramp signal, and generate one or more first output signals. The second channel is configured to receive one or more second input signals, process information associated with the one or more second input signals and a second ramp signal, and generate one or more second output signals. The first ramp signal corresponds to a first phase. The second ramp signal corresponds to a second phase. The first phase and the second phase are different.

An audio driver circuit includes a modulator circuit configured to receive an audio input signal and produce a first modulated digital pulse signal. The first modulated digital pulse signal has a magnitude that switches between a supply power voltage and a supply ground voltage. The audio driver circuit also includes a switched driver circuit coupled to the modulator circuit to receive the first modulated digital pulse signal and configured to provide a second modulated digital pulse signal for driving an MOS (metal oxide semiconductor) output transistor. The second modulated digital pulse signal has a same timing pattern as the first modulated digital pulse signal and has a magnitude that tracks linearly with the magnitude of the audio input signal.

An audio driver circuit includes a modulator circuit configured to receive an audio input signal and produce a first modulated digital pulse signal. The first modulated digital pulse signal has a magnitude that switches between a supply power voltage and a supply ground voltage. The audio driver circuit also includes a switched driver circuit coupled to the modulator circuit to receive the first modulated digital pulse signal and configured to provide a second modulated digital pulse signal for driving an MOS (metal oxide semiconductor) output transistor. The second modulated digital pulse signal has a same timing pattern as the first modulated digital pulse signal and has a magnitude that tracks linearly with the magnitude of the audio input signal.

A switching amplifier comprises a controller, configured to receive an input signal and a reference signal, and to generate a control signal according to the input signal and the reference signal; a pulse-width modulation (PWM) modulator, coupled to the controller, configured to generate a PWM signal according to the input signal and the control signal; a power management unit, coupled to the controller, configured to receive a power supply and the control signal, and to provide an adaptive supply voltage according to the power supply and the control signal; and a switching power stage, coupled to the power management unit and the PWM modulator, configured to generate an output signal according to the PWM signal and the adaptive supply voltage.

Class-D amplifiers and modulators therefor provide control of the DC operating point of the outputs of the amplifiers. The modulators generate a sum and difference signal using combiners and introduce the sum signal to a reference input of the quantizer, while the quantization input of the quantizer receives the difference signal. A difference mode loop filter circuit may filter the difference signal and a common mode loop filter may filter the sum signal. Outputs of the quantizer operate a pair of switching circuits to provide either a differential output with the sum signal set to a constant voltage and the difference signal provided by the signal to be reproduced, or a pair of single-ended outputs with the individual input signals used to generate the sum and difference signal, and selection of a differential or dual single-ended operating mode may be performed by a control circuit that reconfigures the combiners.

This application relates to an amplifier selectively operable in first or second modes. The first mode is a BTL mode with first and second output drivers (103p, 103n) both active to generate respective driving signals that vary with an input signal. The second mode is an SE mode, where the first output driver (103p) is active to generate a driving signal at and the output of the second driver (103n) is held constant. A controller (201) selectively controls the mode based on an indication of output signal amplitude. In the first mode, a ratio of magnitude of the two driving signals varies with the indication of output signal amplitude, i.e. the magnitudes of the two driving signals may vary so as to be not equal.

A system for driving a transducer having a plurality of coils, the system comprising: a modulator for outputting a digital output signal representative of a received analogue input signal at a modulator output; a clock controlled delay element for applying a delay to the digital output signal to generate a first delayed signal at a delay element output; wherein the modulator output is couplable to a first coil of the plurality of the coils of the transducer and the delay element output is couplable to a second coil of the plurality of coils of the transducer.

[Object]

To provide an electronic device and an electroacoustic conversion apparatus that can suppress noise.

[Solving Means]

According to the present disclosure, there is provided an electronic device including a switching element unit that applies a voltage based on a direct-current power supply to one end of an electroacoustic converter in response to a first pulse signal and applies a voltage based on the direct-current power supply to another end of the electroacoustic converter in response to a second pulse signal, and a delay circuit that generates a delay based on a communication frequency in at least one of the first pulse signal and the second pulse signal.