Dual-Output AD Converter for Low-Latency Sensor Feedback
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Solution Overview
Problem
Conventional noise shaping type successive approximation analog-digital converters experience increased latency during digital conversion processes, which can deteriorate the responsiveness of feedback control systems.
Innovation Solution
The proposed AD converter includes an input part, an AD conversion part, and two output parts, where the AD conversion part generates both high-resolution first digital data and low-latency second digital data, with the second digital data being output before the first digital data, allowing for improved feedback control responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a digital filter of a ΔΣ type AD converter is performed to increase the resolution of output data, then the resolution is improved, but the latency increases and responsiveness of feedback control is deteriorated
Solution Approach 1:
The patent segments the digital conversion process into two parallel paths: a first path that performs full digital filtering for high-resolution output data, and a second path that provides low-latency feedback data with reduced filtering. This segmentation allows the system to obtain both high-resolution control data and low-latency feedback signals simultaneously, resolving the contradiction between resolution improvement and latency reduction.
2Measurement precision
If an integration circuit is added to achieve noise shaping characteristic, then the resolution is improved, but the device complexity increases
Solution Approach 1:
The patent uses a copying approach where the second digital data (low-latency feedback signal) is generated as a simplified copy of the full conversion process, omitting the integration and digital filtering stages. This allows the system to maintain noise shaping characteristics through the first path while the second path provides a faster, simpler alternative for feedback control, reducing overall device complexity while maintaining resolution benefits.
Data Source
AI summary
Provided are an analog-to-digital (AD) converter, a sensor processing circuit, and a sensor system capable of improving responsiveness of feedback control. AD converter includes input part, AD conversion part, first output part, and second output part. The analog signal output from sensor is input to input part. AD conversion part digitally converts an analog signal to generate first digital data and second digital data. First output part outputs the first digital data to control circuit. Second output part outputs the second digital data to sensor before first output part outputs the first digital data.