A switching power amplifier includes logic circuitry that generates first and second components of a differential signal, based on received amplitude code and a delayed version of the same. The amplitude code includes a sign and a magnitude. When the sign is positive, a first logic path is configured to generate the first component based on the received amplitude code and the second logic path is configured to generate the second component based on the delayed amplitude code. When the sign is negative, the first logic path is configured to generate the first component based on the delayed amplitude code and the second logic path is configured to generate the second component based on the received amplitude code. The switching power amplifier further includes a differential-to-single ended conversion circuit configured to generate a single-ended signal based on the differential signal.

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.

The present disclosure relates to circuitry comprising: amplifier circuitry configured to receive a variable supply voltage, wherein the supply voltage varies according to an output signal of the amplifier circuitry; monitoring circuitry configured to monitor one or more parameters of an output signal of the amplifier circuitry; and processing circuitry configured to receive an indication of the voltage of the variable supply voltage and an indication of the monitored parameters from the monitoring circuitry and to apply a correction to one or more of the monitored parameters to compensate for coupling between the variable supply voltage and the monitoring circuitry.

The present disclosure relates to circuitry comprising: amplifier circuitry configured to receive a variable supply voltage, wherein the supply voltage varies according to an output signal of the amplifier circuitry; monitoring circuitry configured to monitor one or more parameters of an output signal of the amplifier circuitry; and processing circuitry configured to receive an indication of the voltage of the variable supply voltage and an indication of the monitored parameters from the monitoring circuitry and to apply a correction to one or more of the monitored parameters to compensate for coupling between the variable supply voltage and the monitoring circuitry.

The technology described in this document can be embodied in an apparatus that includes an amplifier that includes a first Zeta converter connected to a power supply and a load. The amplifier also includes a second Zeta converter connected to the power supply and the load. The second Zeta converter is driven by a complementary duty cycle relative to the first Zeta converter. The amplifier also includes a controller to provide an audio signal to the first Zeta converter and the second Zeta converter for delivery to the load.

In certain examples, methods and semiconductor structures are directed to circuit-based apparatus in which an amplifier includes stacked, first and second circuit amplification stages to operate out of phase from one another for providing a push-pull operation, with each of the first and second circuit stages including a switching circuit and an impedance path to drive the switching circuit. The apparatus further includes a waveform-shaping circuit to shape, in response to each of the first and second circuit stages, a voltage signal for presentation to the switching circuit. As may be implemented in various more-specific examples, the apparatus may generate a constant output voltage with high efficiency across a wide range of resistive loads.

A system for sensing an electrical quantity may include a sensing stage configured to sense the electrical quantity and generate a sense signal indicative of the electrical quantity, wherein the electrical quantity is indicative of an electrical signal generated by a Class-DG amplifier configured to drive a load wherein the Class-DG amplifier has multiple signal-level common modes and a common-mode compensator configured to compensate for changes to a common-mode voltage of a differential supply voltage of the driver occurring when switching between signal-level common modes of the Class-DG amplifier.

A system for sensing an electrical quantity may include a sensing stage configured to sense the electrical quantity and generate a sense signal indicative of the electrical quantity, wherein the electrical quantity is indicative of an electrical signal generated by a Class-DG amplifier configured to drive a load wherein the Class-DG amplifier has multiple signal-level common modes and a common-mode compensator configured to compensate for changes to a common-mode voltage of a differential supply voltage of the driver occurring when switching between signal-level common modes of the Class-DG amplifier.

A high-order converter generates a first high-order voltage V.sub.U_P and a second high-order voltage V.sub.U_N that monotonously change with mutually opposite polarities with respect to high-order m bits (1≤m<n) of the digital signal. A low-order converter generates a first low-order voltage and a second low-order voltage that monotonously change with mutually opposite polarities with respect to low-order (n−m) bits of the digital signal. A first amplifier receives one of the first and the second high-order voltages and one of the first and the second low-order voltages to output one differential analog signal. Having a configuration in common with the first amplifier, a second amplifier receives another of the first and the second high-order voltages and another of the first and the second low-order voltages to output another differential analog signal.

It is described a transmitter device (100) and a method for transmitting an analog signal (251, 261) via an electric cable (192). The transmitter device (100) comprises (a) a signal generation circuit (210) for generating a digital transmit signal (211) comprising a sequence of transmit symbols; (b) a filter circuit (230) for spectrally shaping the generated digital transmit signal (211, 221) and for outputting a filtered digital transmit signal (231); (c) a switching unit (240) comprising (c1) a first input terminal (242) for receiving the filtered digital transmit signal (231), (c2) a second input terminal (244) for receiving another digital transmit signal (297), (c3) an output terminal (246) for outputting a digital transmit output signal (241), wherein the digital transmit output signal (241) is based on, depending on a switching state of the switching unit (240), the filtered digital transmit signal (231) or the another digital transmit signal (297), and (c4) a control terminal (248) for receiving a control signal (285) from a control circuit (280), the control signal (285) being indicative for the switching state. The transmitter device (100) further comprises the control circuit (280); and a digital to analog converter (250) for receiving the digital transmit output signal (241) and for converting the received digital transmit output signal (241) to the analog signal (251, 261).