Signal Processing Circuit With Feedback for Low-Power Bridge Sensors
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Solution Overview
Problem
Existing signal processing circuits for bridge resistance sensors face increased power consumption when the amplitude range of the output signal increases.
Innovation Solution
A signal processing circuit design that incorporates a telescopic operational amplifier and a feedback resistance system, where the input voltage to the inverting input terminal is maintained equal to the non-inverting input terminal voltage, suppressing the amplitude range and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the amplitude range of the output signal is increased to improve measurement precision, then the measurement precision is improved, but the power consumption increases
Solution Approach 1:
The operational amplifier dynamically adjusts its operating point through feedback control, maintaining the inverting input terminal voltage equal to the non-inverting input terminal voltage. This dynamic adjustment allows the circuit to achieve high measurement precision while keeping the amplitude range small, thereby reducing power consumption compared to static high-amplitude designs.
Solution Approach 2:
The patent changes the operating parameters of the operational amplifier by maintaining a fixed voltage relationship between input terminals through feedback. This parameter control enables the system to achieve precise measurements with smaller signal amplitudes, directly addressing the contradiction between measurement precision and power consumption.
2Use of energy by moving object
If a telescopic operational amplifier is used to reduce power consumption, then the power consumption is reduced, but the ability to handle large amplitude signals is limited
Solution Approach 1:
The feedback resistance connected between the output terminal and inverting input terminal creates a negative feedback loop that maintains the voltage at the inverting input terminal equal to the non-inverting input terminal voltage. This feedback mechanism enables the telescopic operational amplifier to handle varying signal conditions effectively while maintaining low power consumption, resolving the contradiction between power efficiency and signal handling capability.
3Use of energy by moving object
If the amplitude range is suppressed to reduce power consumption, then the power consumption is reduced, but the measurement range is limited
Solution Approach 1:
The circuit preliminarily establishes the voltage relationship between input terminals through feedback before measurement occurs. By pre-configuring the operational amplifier to maintain equal voltages at both input terminals, the system prepares the optimal operating state that enables low-power operation while preserving measurement capability across the required range.
Data Source
AI summary
A signal processing circuit includes: a first element and a second element connected in series to each other between a first DC power supply and ground, with respective resistance values thereof varying in response to a change in a physical amount of an observation target; an operational amplifier having an inverting input terminal connected to a midpoint between the first element and the second element, a non-inverting input terminal connected to a second DC power supply, and an output terminal; and a feedback resistance connected between the output terminal and the inverting input terminal.