Double-Integration A/D Converter Switching Control
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Solution Overview
Problem
Conventional double-integration type A/D converters face challenges in achieving high noise tolerance and reducing measurement time, with long integration periods leading to increased measurement time and potential inaccuracies.
Innovation Solution
The proposed solution involves a double-integration type A/D converter with a control circuit that manages the switching of input and reference voltages through specific integration periods, allowing for the simultaneous integration of input and reference voltages, which improves noise tolerance and reduces measurement time by optimizing integration periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional double-integration type A/D converter integrates input voltage and reference voltage separately in the same integrator, then zero point error is eliminated, but measurement time becomes long
Solution Approach 1:
The patent divides the integration process into five distinct acts with different switching configurations. Acts 1-3 perform separate integration of input voltage and reference voltage to eliminate zero point error, while Act 4 performs simultaneous integration to reduce measurement time. This segmentation allows the system to achieve both high precision and fast conversion by optimizing each act's purpose.
Solution Approach 2:
The patent implements periodic switching of the first and second switches across five integration acts. The control circuit generates switching signals that periodically change the connection state of switches, enabling the integrator to alternately perform separate integration and simultaneous integration. This periodic action pattern allows the system to cycle through different integration modes, achieving both accuracy and speed.
2Measurement precision
If integration period is extended to improve integration accuracy, then measurement precision improves, but measurement time increases
Solution Approach 1:
The patent performs integration operations that are partially redundant but beneficial. By executing five integration acts including both separate and simultaneous integration, the system performs more integration operations than the minimum required. This excessive action ensures high integration accuracy through multiple measurement cycles while the simultaneous integration acts compensate for the time cost, achieving over-sampling effect that improves precision without linearly increasing time.
3Adaptability or versatility
If multiple switches are used to control integration acts, then integration flexibility improves, but device complexity increases
Solution Approach 1:
The patent uses a single integrator that performs multiple functions through switch control. The same integrator circuit is used for separate integration of input voltage, separate integration of reference voltage, and simultaneous integration of both voltages. This multi-functionality approach allows the system to achieve integration flexibility through software/control logic rather than hardware complexity, reducing device complexity while maintaining versatility.
Data Source
AI summary
A double-integration type A/D converter for performing A/D conversion by integrating an input voltage and a reference voltage is disclosed. The A/D converter includes an integrator configured to integrate the input voltage and the reference voltage; a first switch configured to relay supply of the input voltage to an input terminal of the integrator; a second switch configured to relay supply of the reference voltage to the input terminal; and a control circuit configured to control switching on and off the first switch and the second switch. The control circuit generates a switching signal that switches on and off the first switch and the second switch individually and a switching signal that switches on and off the first switch and the second switch simultaneously. In addition, superimposition of the input voltage and the reference voltage is integrated when the first switch and the second switch are simultaneously switched on.