An amplifier circuit (604") comprising: a delta-PWM-modulator (626") configured to: receive a digital-input-signal; process the digital-input-signal to generate a digital-PWM signal, DPWM signal, based on a modulator-triangular-signal and to generate a delta-pulse-width-modulation signal, delta-PWM signal based on the DPWM signal, wherein the delta-PWM signal is representative of the difference between a square-wave-carrier-signal and said DPWM signal, wherein the square-wave-carrier-signal represents the carrier component of the DPWM signal; a three-level-DAC (612") configured to receive the delta-pulse-width-modulation-signal from the delta-PWM-modulator (626") and provide a three-level-analogue-signal; a loop-integrator (613") comprising: a virtual-ground-node-terminal (616") configured to receive: (i) the three-level-analogue-signal from the three-level DAC (612"); and (ii) a feedback-signal from an output stage (617") of the amplifier circuit via a feedback loop (620"); an integrator-output-terminal (644") configured to provide a loop-integrator-output-signal, which is proportional to an integral of the signals received at the virtual-ground-node-terminal; and a comparator (615") comprising: a comparator-input-terminal (646") configured to receive the loop-integrator-output-signal; a comparator-reference-terminal (635") configured to receive a triangular-reference-signal that corresponds to the integral of the square-wave-carrier-signal; and a comparator-output-terminal configured to provide a drive-signal suitable for driving an output-stage (617") of the amplifier circuit. a delta-PWM-modulator (626") configured to: receive a digital-input-signal; process the digital-input-signal to generate a digital-PWM signal, DPWM signal, based on a modulator-triangular-signal and to generate a delta-pulse-width-modulation signal, delta-PWM signal based on the DPWM signal, wherein the delta-PWM signal is representative of the difference between a square-wave-carrier-signal and said DPWM signal, wherein the square-wave-carrier-signal represents the carrier component of the DPWM signal; receive a digital-input-signal; process the digital-input-signal to generate a digital-PWM signal, DPWM signal, based on a modulator-triangular-signal and to generate a delta-pulse-width-modulation signal, delta-PWM signal based on the DPWM signal, wherein the delta-PWM signal is representative of the difference between a square-wave-carrier-signal and said DPWM signal, wherein the square-wave-carrier-signal represents the carrier component of the DPWM signal; a three-level-DAC (612") configured to receive the delta-pulse-width-modulation-signal from the delta-PWM-modulator (626") and provide a three-level-analogue-signal; a loop-integrator (613") comprising: a virtual-ground-node-terminal (616") configured to receive: (i) the three-level-analogue-signal from the three-level DAC (612"); and (ii) a feedback-signal from an output stage (617") of the amplifier circuit via a feedback loop (620"); an integrator-output-terminal (644") configured to provide a loop-integrator-output-signal, which is proportional to an integral of the signals received at the virtual-ground-node-terminal; and a virtual-ground-node-terminal (616") configured to receive: (i) the three-level-analogue-signal from the three-level DAC (612"); and (ii) a feedback-signal from an output stage (617") of the amplifier circuit via a feedback loop (620"); an integrator-output-terminal (644") configured to provide a loop-integrator-output-signal, which is proportional to an integral of the signals received at the virtual-ground-node-terminal; and a comparator (615") comprising: a comparator-input-terminal (646") configured to receive the loop-integrator-output-signal; a comparator-reference-terminal (635") configured to receive a triangular-reference-signal that corresponds to the integral of the square-wave-carrier-signal; and a comparator-output-terminal configured to provide a drive-signal suitable for driving an output-stage (617") of the amplifier circuit. a comparator-input-terminal (646") configured to receive the loop-integrator-output-signal; a comparator-reference-terminal (635") configured to receive a triangular-reference-signal that corresponds to the integral of the square-wave-carrier-signal; and a comparator-output-terminal configured to provide a drive-signal suitable for driving an output-stage (617") of the amplifier circuit.