Self-Driven Weak-Signal Sensor Reading Circuit With Low Power
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional weak-signal reading circuits for sensors suffer from high power consumption, complex circuit design, long delay response, serious crosstalk, and low-level integration, with electrical signal reliability heavily dependent on active modules like transistors and power supply.
Innovation Solution
A weak-signal reading circuit for sensors is designed with a sensing signal input amplifying unit comprising a first transistor, where the gate and drain are connected to the sensor, allowing the circuit to be self-driven by the sensor-generated voltage without an extra drive circuit, thereby achieving low power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional weak-signal reading circuits use active modules like transistors and power supply for signal amplification, then the electrical signal can be amplified, but the power consumption increases and the circuit design becomes complex
Solution Approach 1:
The sensor itself serves as the drive circuit by directly utilizing its generated voltage to control the transistor gate, eliminating the need for external power supply and drive circuits. The sensor's output voltage automatically modulates the transistor to achieve signal amplification without additional energy input.
Solution Approach 2:
The external power supply and drive circuits are extracted and removed from the system. The patent uses only the sensor's own generated voltage, completely eliminating external power consumption for the amplification process.
2Ease of operation
If conventional circuits use external drive circuits to control the transistor, then the transistor can be properly controlled, but the circuit design becomes complex and integration level decreases
Solution Approach 1:
The drive function is merged with the sensor itself. The sensor's output terminal directly connects to the transistor gate, combining the sensing and driving functions into a single integrated structure without separate control circuits.
Solution Approach 2:
The sensor serves multiple functions simultaneously: it acts as both the sensing element and the drive circuit. The same component that detects the signal also provides the control voltage for the transistor, achieving multi-functionality.
3Productivity
If conventional reading circuits use multiple active modules for signal processing, then the signal can be processed, but the delay response increases
Solution Approach 1:
Multiple active modules are extracted and replaced with a single transistor controlled by the sensor's own voltage. This reduction in the number of active components directly reduces the signal processing time and delay response.
4Productivity
If conventional circuits use multiple active modules and external power supply, then the circuit can function, but the reliability depends heavily on their stability
Solution Approach 1:
The circuit uses the sensor's own generated voltage for control, making the system self-sufficient and independent of external power supply stability. The sensor's voltage inherently tracks with its output signal, providing automatic adaptation without external regulation.
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 proposed circuit achieves low power consumption, simplified circuit design, reduced delay response, minimized crosstalk, and improved integration, while ensuring reliable electrical signal reading independent of external power supply stability.
Implementation Method 1
a first transistor, wherein a gate and a drain of the first transistor are connected with a sensor; a signal reading unit, which is connected with a source of the first transistor, the first transistor is turned on when the sensor generates a sensing signal
Data Source
AI summary
Provided is a weak-signal reading circuit for a sensor, comprising a sensing signal input amplifying unit and a signal reading unit. The sensing signal input amplifying unit comprises a first transistor, wherein a gate and a drain of the first transistor are connected with a sensor; the signal reading unit is connected to a source of the first transistor, the first transistor is turned on when the sensor generates a sensing signal, so that the sensing signal is captured by the signal reading unit. When the sensor senses a signal and generates a voltage, the first transistor tends to be switched on, then the signal reading unit reads the sensing signal through the first transistor which has been turned on, that is, by providing the first transistor, the weak-signal reading circuit for sensor can be self-driven according to the voltage generated by the sensor without an extra drive circuit, thereby achieving low power consumption.