AC Carrier Sensor Biasing for Noise-Resistant Matter Detection
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Solution Overview
Problem
Existing sensors have undesirably low sensitivity to detect features of interest, resulting in weak signals that are not useful for detection, and are susceptible to noise from charge buildup and stray charges.
Innovation Solution
The technique measures capacitance or transconductance between a control terminal and a semiconductor channel to indicate the presence of matter, which is less susceptible to noise and provides a more accurate indication of matter at the sensor surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sensor measurement techniques are used, then device complexity is reduced, but measurement precision deteriorates due to low sensitivity and weak signals
Solution Approach 1:
The patent replaces conventional mechanical or simple electrical sensing mechanisms with an electrical sensing technique that measures capacitance or transconductance changes. This substitution enables higher measurement precision through electrical field interactions while maintaining manageable device complexity through circuit-based implementation.
Solution Approach 2:
The patent changes the measurement parameter from direct signal detection to capacitance or transconductance measurement. By transforming the detection approach to measure electrical characteristics (capacitance, transconductance) rather than direct signal strength, the system achieves improved sensitivity without proportionally increasing complexity.
2Reliability
If conventional sensing methods are used, then ease of operation is maintained, but reliability deteriorates due to susceptibility to noise from charge buildup and stray charges
Solution Approach 1:
The patent substitutes conventional signal-based detection with electrical field-based capacitance and transconductance measurement. This replacement inherently reduces susceptibility to noise from charge buildup and stray charges, improving reliability while maintaining operational simplicity through standard electrical measurement techniques.
Solution Approach 2:
The patent introduces capacitance and transconductance as intermediary parameters that mediate between the sensor and the detection circuitry. These intermediary electrical characteristics provide a more reliable transmission of matter presence information while filtering out noise from charge buildup and stray charges.
3Measurement precision
If signal strength is increased to overcome low sensitivity, then measurement precision improves, but object-generated harmful factors worsen due to enhanced noise from charge buildup
Solution Approach 1:
The patent replaces direct signal strength enhancement with capacitance and transconductance measurement techniques. This substitution allows for improved measurement precision through electrical field interactions while avoiding the generation of harmful noise from charge buildup that would result from conventional signal amplification approaches.
Data Source
AI summary
Described herein are techniques that, in some embodiments, bias a sensor using an alternating current (AC) signal having a carrier frequency and a modulation frequency to detect the presence of matter proximate the sensor. In some embodiments, an AC current flowing in the sensor may be measured to detect the presence of matter proximate the sensor. In some embodiments, the carrier frequency may be based on an electrochemical interface at a surface of the sensor, and the modulation frequency may be based on a characteristic of a semiconductor channel of the sensor. Advantageously, detection techniques performed in this manner may, in some embodiments, mitigate impacts of the electrochemical interface and/or the semiconductor channel on measurement accuracy.