Delta-Sigma Modulator Feedback Compensation for Pulse Asymmetry
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Solution Overview
Problem
Delta-sigma modulators introduce distortion in analog signal components at a target frequency due to pulse waveform asymmetry, which existing technologies only compensate for after modulation, lacking self-compensation within the modulator.
Innovation Solution
Incorporating a compensator within the delta-sigma modulator to provide a compensation signal for distortion in the frequency component at the target frequency, using a detector to identify asymmetry in the pulse train and a generator to create a compensation signal, which can be applied through internal paths to stabilize operation and compensate for distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a delta-sigma modulator is used to generate quantized data, then the analog signal component at the target frequency is extracted, but distortion occurs in the frequency component due to pulse waveform asymmetry
Solution Approach 1:
The patent converts the harmful distortion caused by pulse waveform asymmetry into a beneficial compensation mechanism. The detector identifies the asymmetric waveform characteristics, and the compensator generates a compensation signal that, when combined with the original quantized data, eliminates the distortion. This transforms the harmful asymmetry effect into a opportunity for precision improvement.
Solution Approach 2:
The patent implements a feedback mechanism where the detector continuously monitors the pulse train output from the quantizer, detects asymmetry in real-time, and feeds this information to the compensator. The compensator then adjusts the compensation signal based on the detected asymmetry, creating a closed-loop system that continuously corrects distortion and maintains high signal quality.
2Reliability
If compensation for distortion is performed after delta-sigma modulation, then signal characteristics are improved, but the modulator itself cannot self-compensate
Solution Approach 1:
The patent merges the compensation function directly into the modulator structure by integrating the detector and compensator within the modulator's internal paths. This combination allows the modulator to perform both modulation and distortion compensation in a unified structure, eliminating the need for separate post-modulation compensation stages and enabling self-compensation capability.
Solution Approach 2:
The patent enables the delta-sigma modulator to self-compensate for its own distortion by incorporating detection and compensation functions within itself. The detector monitors the modulator's own output, and the compensator generates correction signals that are fed back through internal paths to cancel the distortion, allowing the system to self-correct without external intervention.
3Productivity
If the pulse waveform of the pulse train is asymmetric, then the quantized data is generated efficiently, but distortion is introduced in the analog signal
Solution Approach 1:
The patent applies preliminary compensation action by detecting pulse waveform asymmetry and generating compensation signals before the distorted signal is fully formed. The compensator uses the detected asymmetry information to pre-correct the quantized data through internal feedback paths, preventing the distortion from propagating to the final output signal.
Data Source
AI summary
A delta-sigma modulator is provided with: a loop filter 30; a quantizer 36 that generates quantized data on the basis of an output from the loop filter 30; an internal path 42 connected to the loop filter 30 or the quantizer 36; and a compensator 38 that provides, to the internal path 42, a compensation signal for compensating for distortion that occurs in a frequency component at a target frequency, the frequency component being among frequency components of a pulse train corresponding to the quantized data.