Differential Mode Converter for Single-Ended Chopper Measurement
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Solution Overview
Problem
Existing electronic circuits face limitations in applying chopper circuits to devices requiring single-ended inputs, such as medical equipment and mobile phones, due to the need for differential inputs, which results in noise and offset voltage issues affecting measurement accuracy.
Innovation Solution
A differential mode converter is developed to convert single-ended input voltage signals into differential signals, which are then processed by a chopper circuit to minimize noise and offset, and subsequently filtered and converted to digital signals for accurate resistance measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a chopper circuit is used to minimize noise and offset voltage, then measurement precision is improved, but the device requires differential inputs which limits adaptability to single-ended input devices
Solution Approach 1:
An input mode converter is introduced as an intermediary component between the single-ended input device and the chopper circuit. This converter transforms the single-ended input signal into a differential signal format that the chopper circuit can process, thereby enabling the chopper circuit to maintain its noise-minimizing function while being compatible with single-ended input devices.
Solution Approach 2:
The input mode converter changes the signal format parameter from single-ended to differential mode. By modifying the signal representation rather than the physical connection, the system maintains compatibility with single-ended devices while enabling the chopper circuit to operate in its optimal differential mode for noise reduction.
2Measurement precision
If a chopper circuit requiring differential inputs is applied, then noise and offset voltage are minimized, but device complexity increases due to additional conversion components
Solution Approach 1:
The input mode converter serves as a minimal intermediary that performs only the essential signal format transformation. By keeping the converter's functionality focused and simple, the additional complexity introduced is minimized while still achieving the goal of noise reduction through the chopper circuit.
3Device complexity
If single-ended input is used directly without conversion, then device complexity is reduced, but measurement precision deteriorates due to noise and offset voltage
Solution Approach 1:
The input mode converter is designed as a simple intermediary component that adds minimal complexity to the overall system. Its sole function is to transform the signal format, enabling the chopper circuit to operate effectively without requiring complex additional components, thus maintaining a relatively simple circuit structure while improving measurement precision.
Data Source
AI summary
A differential mode converter that includes an input mode converter configured to convert an input voltage in a single-ended mode into a first differential voltage and a second differential voltage to be output, the first differential voltage and the second differential voltage being symmetric with respect to a reference voltage and having a form of a square wave; and a chopper configured to receive the first differential voltage and the second differential voltage and determine a first chopping voltage and a second chopping voltage based on the first differential voltage and the second differential voltage to output the first chopping voltage and the second chopping voltage, the first chopping voltage and the second chopping voltage being symmetric with respect to the reference voltage and having a form of a DC voltage.