Signal Generator Feedback Calibration for Analog Distortion Compensation
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Solution Overview
Problem
Existing signal generating apparatuses face challenges in accurately compensating for distortion and attenuation caused by analog circuits, which vary with environmental changes, without the need for a separate AD converter, leading to increased structure and cost.
Innovation Solution
Incorporating a DA converter, comparing section, and control section within the signal generating apparatus to compare and adjust the output signal, allowing for accurate compensation of distortion and attenuation without a separate AD converter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate AD converter is provided to measure the output signal for accurate compensation, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines the AD converter function with the existing DA converter to form a dual-conversion apparatus. The same hardware platform performs both digital-to-analog conversion for signal generation and analog-to-digital conversion for output measurement, eliminating the need for completely separate measurement equipment while enabling accurate compensation for analog circuit characteristics.
Solution Approach 2:
The signal generating apparatus is designed to perform multiple functions: it generates analog signals through the DA converter and simultaneously measures the output signals through the AD converter. This multi-functional design allows the single apparatus to both create test signals and characterize the analog circuit under test, reducing overall system complexity.
2Reliability
If environment-dependent distortion and attenuation are compensated in real-time, then signal reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the AD converter measures the actual output signal from the analog circuit, and this measurement is used to adjust and compensate for distortion and attenuation characteristics. The control section processes the measured data and modifies the DA converter output accordingly, creating a closed-loop system that adapts to environmental changes and maintains signal reliability.
Solution Approach 2:
The signal generating apparatus performs self-characterization and self-compensation by measuring its own output signals and adjusting its operation accordingly. The system uses its built-in AD converter to monitor its performance and automatically correct for analog circuit imperfections without requiring external calibration equipment or manual intervention.
Data Source
AI summary
Provided is a signal generating apparatus comprising a DA converter that outputs an output signal corresponding to input data supplied thereto; a sample/hold unit that is provided between the DA converter and an output end of the signal generating apparatus, and that samples an output voltage of the DA converter and holds the sampled output voltage; a comparing section that compares (i) a level of a signal output from an analog circuit that propagates the output signal to output a signal corresponding to the input data to (ii) a level of the signal output by the DA converter; and a control section that, during a holding period, (iii) provides the DA converter with comparison data instead of the input data to cause the DA converter to output a comparison voltage corresponding to the comparison data, (iv) causes the comparing section to compare a voltage of the signal output by the analog circuit to the comparison voltage, and (v) adjusts the output voltage of the DA converter according to the input data based on a comparison result of the comparing section.