Digital Amplifier Feedback Circuit for High-Speed PDM Signals
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Solution Overview
Problem
Existing digital amplifiers require complex circuit structures and impose limitations on processing speed when handling high-speed digital signals, especially when the input signal is a digital binary signal using Pulse Density Modulation, as they need a quantizer and sampler, which are not necessary for digital signals and hinder accurate amplification.
Innovation Solution
A digital amplifier with a pulse-width adjustment circuit that adjusts the pulse width of digital signals based on feedback signals, combined with a switching circuit for amplification and a feedback signal generator, eliminating the need for a quantizer and sampler, thus simplifying the circuit structure and enabling feedback for digital input signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a quantizer and sampler are used to process digital input signals, then the amplifier can handle PDM signals, but the circuit structure becomes complex and processing speed is limited
Solution Approach 1:
The patent removes the quantizer and sampler from the signal processing path when handling digital input signals. The switching circuit directly processes the digital input signal without these additional components, thereby simplifying the circuit structure while maintaining the ability to handle digital signals.
Solution Approach 2:
The amplifier dynamically adapts its processing path based on the input signal type. When a digital signal is detected, the signal processing bypasses the quantizer and sampler, allowing the circuit to optimize its complexity based on the actual input requirements.
2Adaptability or versatility
If a quantizer and sampler are used, then digital signal processing is enabled, but processing speed at high sampling frequencies is limited
Solution Approach 1:
The quantizer and sampler are extracted from the high-speed signal path. By removing these components that limit processing speed, the amplifier can directly process digital signals at high sampling frequencies such as 5.6 MHz, 11 MHz, and 22 MHz without the bottlenecks imposed by quantization and sampling operations.
3Device complexity
If feedback is not provided for digital signals, then the circuit remains simple, but accurate amplification cannot be achieved
Solution Approach 1:
The patent implements a feedback mechanism where the output signal is fed back to the input side of the switching circuit. This feedback path enables accurate amplification by allowing the system to correct errors and maintain precision without adding significant complexity to the overall circuit structure.
Data Source
AI summary
A digital amplifier includes a pulse-width adjustment circuit that adjusts the pulse width of a digital signal, a switching circuit that amplifies the output signal of the pulse-width adjustment circuit, and a feedback signal generator that generates a feedback signal based on the output signal of the switching circuit.