Integrated Audio Amplifier Circuit With Built-In Low-Pass Filtering
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Solution Overview
Problem
Existing audio amplifier circuits with separate filter and amplifier components often result in increased circuit complexity, cost, power consumption, and distortion, as they require additional components and more complex designs to achieve desired frequency responses.
Innovation Solution
An audio amplifier circuit with an integrated digital-to-analog converter (DAC) filter, featuring a low-pass closed loop frequency response, reduced circuit complexity, and lower power dissipation, achieved through the use of impedance networks and amplifier stages with feedback and feedforward paths, allowing for reduced distortion and lower power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate filter and amplifier circuits are used, then frequency response control is achieved, but circuit complexity increases
Solution Approach 1:
The patent combines the filter circuit and amplifier circuit into a single integrated audio amplifier device. The filter section with capacitors and resistors is merged with the amplifier section sharing common power supply connections and signal paths, eliminating the need for separate discrete filter and amplifier units while maintaining independent frequency response control and amplification functions.
2Manufacturing precision
If separate filter and amplifier circuits are used, then frequency response control is achieved, but cost increases
Solution Approach 1:
The patent integrates filter and amplifier functions into a single circuit board assembly with shared components such as power supply decoupling capacitors and common signal ground connections. This consolidation reduces the total component count, PCB real estate requirements, and assembly complexity, thereby reducing manufacturing costs while maintaining precise frequency response control through the filter section.
3Manufacturing precision
If separate filter and amplifier circuits are used, then frequency response control is achieved, but power consumption increases
Solution Approach 1:
The patent merges the filter and amplifier circuits into a single integrated device with shared power supply rails and common ground connections. The filter section processes signals passively using RC networks before the amplifier section, eliminating redundant power consumption that would occur in separate discrete units while maintaining effective frequency response control.
4Manufacturing precision
If separate filter and amplifier circuits are used, then frequency response control is achieved, but distortion increases
Solution Approach 1:
The patent integrates the filter and amplifier sections with carefully managed signal paths and power supply connections. The shared power supply decoupling and common ground structure reduce ground loops and power supply noise that could cause distortion, while the filter section effectively rolls off high-frequency switching components before they reach the amplifier, reducing overall distortion despite the integrated architecture.
Data Source
AI summary
Embodiments provide an audio amplifier circuit with integrated (built-in) filter (e.g., a digital-to-analog converter (DAC) filter). The audio amplifier circuit may have a non-flat (e.g., low-pass) closed loop frequency response. The audio amplifier circuit may include a low pass filter coupled between an input terminal that receives the input analog audio signal and the input of the gain stage of the amplifier. In some embodiments, additional impedance networks may be included to produce a desired low-pass filter response, such as a second order filter, a third order filter, and/or another suitable filter response. Other embodiments may be described and/or claimed.