Digital amplifier

Digital amplifier for converting an audio signal to a power output comprising:

• a power supply port;
• a bridge circuit with at least one pair of switches;
• and
• a ripple suppression circuit for suppressing voltage ripples in a supply voltage supplied to the bridge circuit with at least one pair of switches via the voltage supply port;
• wherein the ripple suppression circuit is arranged between the power supply port and the bridge circuit with at least one pair of switches;
• and
• wherein the ripple suppression circuit comprises a linearly controlled voltage controller;
• wherein the switches are transistors;
• wherein the ripple suppression circuit is connected to a first transistor of the at least one pair of transistors;
• and
• wherein the ripple suppression circuit is configured to drive the first transistor of the at least one pair of transistors in a linear region of the first transistor;
• wherein the ripple suppression circuit is configured to generate an error signal on the basis of a comparison of a voltage at the power supply port to a reference voltage and a voltage drop over a second transistor of the at least one pair of transistors and to control a gate voltage of the first transistor on the basis of the error signal to drive the first transistor in the linear region.

Digital amplifier for converting an audio signal to a power output comprising:

• a power supply port;
• a bridge circuit with at least one pair of switches;
• a ripple suppression circuit for suppressing voltage ripples in a supply voltage supplied to the bridge circuit with at least one pair of switches via the voltage supply port;
• wherein the ripple suppression circuit is arranged between the power supply port and the bridge circuit with at least one pair of switches;
• and
• a reference voltage source which generates the reference voltage on the basis of a voltage at the power supply port to ensure a required compensation margin.

Digital amplifier for converting an audio signal to a power output comprising:

• a power supply port;
• a bridge circuit with at least one pair of switches;
• and
• a ripple suppression circuit for suppressing voltage ripples in a supply voltage supplied to the bridge circuit with at least one pair of switches via the voltage supply port;
• wherein the ripple suppression circuit is arranged between the power supply port and the bridge circuit with at least one pair of switches;
• wherein the ripple suppression circuit comprises a linearly controlled voltage controller;
• wherein the switches are transistors;
• wherein the ripple suppression circuit is connected to a first transistor of the at least one pair of transistors;
• and
• wherein the ripple suppression circuit is configured to drive the first transistor of the at least one pair of transistors in a linear region of the first transistor;
• further comprising a reference voltage source which generates the reference voltage on the basis of a voltage at the power supply port to ensure a required compensation margin.

Digital amplifier for converting an audio signal to a power output comprising:

• a power supply port;
• a bridge circuit with at least one pair of switches;
• and
• a ripple suppression circuit for suppressing voltage ripples in a supply voltage supplied to the bridge circuit with at least one pair of switches via the voltage supply port;
• wherein the ripple suppression circuit is arranged between the power supply port and the bridge circuit with at least one pair of switches;
• wherein the ripple suppression circuit comprises a linearly controlled voltage controller;
• wherein the linearly controlled voltage controller is for multiple channels of the amplifier;
• wherein the least one pair of switches is configured as an H-bridge;
• and
• wherein a coarse supply voltage setting is applied in front of the linearly controlled voltage controller.