Digital Harmonic Compensation for Low-Distortion Analog Output
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Solution Overview
Problem
Operational amplifiers often introduce harmonic distortion in analog circuits when dealing with weak or strong signals, leading to non-linear operation and distorted output signals.
Innovation Solution
A harmonic compensation device generates harmonic waves in the digital domain to offset harmonic distortion in the analog domain, using a harmonic compensator, conversion circuit, and analog output circuit, with optional measuring circuits to adjust parameters for optimal compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If operational amplifier is used to amplify weak or strong signals, then signal amplification is achieved, but harmonic distortion occurs due to non-linear operation
Solution Approach 1:
The patent applies preliminary action by generating harmonic compensation signals in advance through a digital signal processor before the operational amplifier processes the input signal. The DSP calculates the expected harmonic distortion components and creates compensation signals that pre-counteract the distortion, which are then combined with the original signal before amplification, reducing the harmonic distortion in the final output.
Solution Approach 2:
The patent converts the harmful harmonic distortion into a beneficial compensation mechanism. By analyzing the operational amplifier's non-linear characteristics, the system generates compensation signals that utilize the predicted distortion components to create an opposing signal, effectively transforming the harmful distortion effect into a useful correction that improves output signal quality.
2Object-generated harmful factors
If digital signal processing is used to generate compensation signals, then harmonic distortion is reduced, but device complexity increases
Solution Approach 1:
The patent introduces a digital signal processor as an intermediary component between the input signal and the operational amplifier. This DSP acts as a mediator that calculates and generates harmonic compensation signals based on the input signal characteristics and the known non-linear characteristics of the operational amplifier, then combines these compensation signals with the original signal before amplification, reducing harmonic distortion without requiring modification of the operational amplifier itself.
Data Source
AI summary
Disclosed is a harmonic compensation device capable of effectively reducing the harmonic distortion of an analog output signal. The harmonic compensation device includes a harmonic compensator, a mixer, a digital-to-analog converter, and an analog output circuit. The harmonic compensator is configured to generate a digital compensation signal according to a digital input signal, in which the digital compensation signal includes the harmonic components of the digital input signal. The mixer is configured to generate a digital output signal according to the digital input signal and the digital compensation signal. The digital-to-analog converter is configured to generate an analog input signal according to the digital output signal. The analog output circuit is configured to generate an analog output signal according to the analog input signal.