Single-Drive C2V Converter With Capacitive Feedback Noise Rejection
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Solution Overview
Problem
Existing capacitance-to-voltage (C2V) converters suffer from high noise, power consumption, and interference issues, particularly in dual drive systems, which degrade signal quality and efficiency.
Innovation Solution
Implementing a continuous time single drive C2V converter with a capacitive bridge and feedback amplifier structure that uses a single reference voltage signal, suppressing noise and parasitic capacitances, and employing capacitive feedback to reduce interference and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a dual drive C2V converter is used, then conversion capability is provided, but noise and interference increase
Solution Approach 1:
The patent extracts and removes the harmful dual drive configuration, retaining only a single drive mechanism. This eliminates the noise and interference generated by dual drive operation while preserving the essential C2V conversion functionality through the capacitive bridge and feedback amplifier structure.
Solution Approach 2:
The patent converts the harmful effect of drive noise into a benefit by using the feedback amplifier to actively suppress and cancel noise signals. The feedback mechanism detects noise from the single drive and generates counteracting signals, transforming the inherent noise problem into an opportunity for active noise cancellation and improved signal quality.
2Measurement precision
If conventional C2V converter structures are used, then capacitance conversion is achieved, but power consumption is high
Solution Approach 1:
The patent changes the operational parameters of the C2V converter by implementing a continuous-time architecture with optimized feedback control. This allows the system to achieve accurate capacitance conversion while operating at lower power levels through efficient feedback regulation and reduced unnecessary switching activity.
3Measurement precision
If noise suppression techniques are applied, then signal quality improves, but device complexity increases
Solution Approach 1:
The patent merges the noise suppression functionality directly into the core C2V conversion architecture through the feedback amplifier. Rather than adding separate noise filtering stages, the noise cancellation is integrated into the signal path itself, achieving signal quality improvement without proportionally increasing device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively suppresses noise and interference, enhances power efficiency, and improves signal quality by reducing noise folding and power consumption, offering superior common mode noise rejection and power-to-noise tradeoff.
Implementation Method 1
employing capacitive feedback to reduce interference and power consumption
Implementation Method 2
a capacitance-to-voltage (C2V) converter can be employed in electronic devices to convert a capacitance value
Data Source
AI summary
A continuous time single drive capacitance-to-voltage (C2V) converter can be employed for single sensor, balanced single sensor, or differential sensor. First sensor and/or second sensor can be employed to sense a condition. A capacitive bridge can comprise a first capacitive digital-to-analog-converter (DAC) and second capacitive DAC as a differential node. First capacitive DAC can be associated with first sensor, and second capacitive DAC can be associated with a third capacitive DAC, in series with first sensor, if single sensor is implemented or the second sensor if balanced single sensor or differential sensor is implemented. Capacitive bridge can be connected to differential input of a capacitive feedback amplifier that can be a continuous time amplifier with no signal sampling and no noise folding. Capacitive feedback amplifier can comprise capacitively coupled input common mode feedback, which can remove noise from a sensor drive, and output common mode feedback.