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Class D audio amplifier with adjustable loop filter characteristics

An audio amplifier and loop filter technology, applied in audio amplifiers, amplifiers with semiconductor devices/discharge tubes, low-frequency amplifiers, etc., can solve problems such as feedback loop instability

Active Publication Date: 2015-01-07
INFINEON TECH AUSTRIA AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the just stable design of the loop filter with the maximum setting of the adjustable modulation frequency means that the feedback loop tends to become unstable if a modulation frequency lower than the maximum frequency setting is chosen

Method used

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  • Class D audio amplifier with adjustable loop filter characteristics
  • Class D audio amplifier with adjustable loop filter characteristics
  • Class D audio amplifier with adjustable loop filter characteristics

Examples

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Embodiment Construction

[0057] figure 1 A PWM-based class-D audio amplifier 1100 including a balanced / differential or H-bridge driver 1101 coupled to a controller 1103 is schematically shown in accordance with a preferred embodiment of the present invention, e.g. Figure 12 The multilevel H-bridge output driver 401 described above is similar. The class D audio amplifier 1100 utilizes complex modulation frequency based switching between different frequency response characteristics of the tunable loop filter 1117 of the feedback loop or path of the class D amplifier 1100 explained in detail below. The schematically shown H-bridge driver 1101 includes a gate drive circuit 1109 that increases the signal amplitudes of the corresponding pulse width modulated control signals of the eight semiconductor switches of the balanced output driver 1107 to allow the individual semiconductor The switches are appropriately set to levels in the ON and OFF states. The gate driving circuit 1109 may include various lev...

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PUM

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Abstract

The present invention relates to a class D audio amplifier comprising a pulse width modulator, an adjustable loop filter and a feedback loop. The pulse width modulator generates a first set of pulse width modulated control signals at an adjustable modulation frequency for respective switch control terminals of a first output driver. A controller of the class D audio amplifier is configured to control frequency response characteristics of the adjustable loop filter based on a frequency setting of the adjustable modulation frequency.

Description

technical field [0001] The invention relates to a class D audio amplifier, which includes a pulse width modulator, an adjustable loop filter and a feedback loop. The pulse width modulator generates a first set of pulse width modulated control signals at an adjustable modulation frequency for corresponding switch control terminals of the first output driver. The controller of the class D audio amplifier is configured to control the frequency response characteristic of the adjustable loop filter based on the frequency setting of the adjustable modulation frequency. Background technique [0002] A Class D audio amplifier is well known as an audio power amplifier that is generally thought of as providing energy-efficient audio drive of speaker loads by switching a pulse width modulated (PWM) or pulse density modulated (PDM) signal across the speaker load. Class D audio amplifiers typically include an H-bridge driver with a pair of outputs coupled to respective sides or terminal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/217
CPCH03F3/217H02M7/4837H03F1/0205H03F3/183H03F2200/03H03F2200/351
Inventor 米克尔·霍耶尔比
Owner INFINEON TECH AUSTRIA AG
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