Abstract: An audio amplification circuit comprises an amplifier having an input and an output, as well as an audio output to which a load can be connected. It additionally comprises a first driver stage having an input and an output which is not coupled to the audio output, and a second driver stage having an input and an output which is coupled to the audio output. The output from the amplifier is selectively coupled to the input of the first driver stage in a first phase of operation and then selectively to the input of the second driver stage in a second phase of operation following the first phase of operation.

Abstract: There is described a self oscillating modulator circuit comprising at least two coupled self oscillating loop modules, that achieved a good efficiency and a good linearity.

Abstract: An audio amplification circuit is provided having an amplifier that receives an input signal, an output, and a digital control input for receiving a control value in a number n of bits; a comparator having a first input that receives the amplifier's output signal image, a second input that receives a reference potential, and an output; and a thermometer counter having a selection input coupled to the comparator output, and an output delivering an n-bit digital value to the amplifier control input. The amplifier comprises a differential input stage having a first and a second differential branch, each traversed by a bias current, the current in the first branch being modifiable by n basic current sources which each deliver either a current identical for all current sources, or no current, as a function of one respective bit of the digital control value received at the control input.

Abstract: There is described a self oscillating modulator circuit comprising at least two coupled self oscillating loop modules, that achieved a good efficiency and a good linearity.

Abstract: An audio amplification circuit is provided having an amplifier that receives an input signal, an output, and a digital control input for receiving a control value in a number n of bits; a comparator having a first input that receives the amplifier's output signal image, a second input that receives a reference potential, and an output; and a thermometer counter having a selection input coupled to the comparator output, and an output delivering an n-bit digital value to the amplifier control input. The amplifier comprises a differential input stage having a first and a second differential branch, each traversed by a bias current, the current in the first branch being modifiable by n basic current sources which each deliver either a current identical for all current sources, or no current, as a function of one respective bit of the digital control value received at the control input.

Abstract: An audio amplification circuit comprises an amplifier having an input and an output, as well as an audio output to which a load can be connected. It additionally comprises a first driver stage having an input and an output which is not coupled to the audio output, and a second driver stage having an input and an output which is coupled to the audio output. The output from the amplifier is selectively coupled to the input of the first driver stage in a first phase of operation and then selectively to the input of the second driver stage in a second phase of operation following the first phase of operation.

Abstract: An amplifier having at least one switch controlled by an output voltage of a hysteresis block, wherein the hysteresis block is adapted to receive an input voltage signal based on an integration of an error signal, a low threshold voltage and a high threshold voltage, and is arranged to change the output voltage from a first value to a second value when the input voltage signal is higher than the high threshold voltage and to change the output voltage from the second value to the first value when the input voltage signal is lower than the low threshold voltage, and wherein the low threshold voltage is equal to Vref??VDD and the high threshold voltage is equal to Vref+?VDD, where Vref is a common mode voltage level, ? is a non-zero constant, and VDD is a power supply voltage.

Abstract: An amplifier having at least one switch controlled by an output voltage of a hysteresis block, wherein the hysteresis block is adapted to receive an input voltage signal based on an integration of an error signal, a low threshold voltage and a high threshold voltage, and is arranged to change the output voltage from a first value to a second value when the input voltage signal is higher than the high threshold voltage and to change the output voltage from the second value to the first value when the input voltage signal is lower than the low threshold voltage, and wherein the low threshold voltage is equal to Vref??VDD and the high threshold voltage is equal to Vref+?VDD, where Vref is a common mode voltage level, ? is a non-zero constant, and VDD is a power supply voltage.

Abstract: An amplifier having at least one switch controlled by an output voltage of a hysteresis block, wherein the hysteresis block is adapted to receive an input voltage signal based on an integration of an error signal, a low threshold voltage and a high threshold voltage, and is arranged to change the output voltage from a first value to a second value when the input voltage signal is higher than the high threshold voltage and to change the output voltage from the second value to the first value when the input voltage signal is lower than the low threshold voltage, and wherein the low threshold voltage is equal to Vref??VDD and the high threshold voltage is equal to Vref+?VDD, where Vref is a common mode voltage level, ? is a non-zero constant, and VDD is a power supply voltage.