Connection Impedance Detection Circuit With Switchable Op-Amp Path
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Solution Overview
Problem
Existing detection circuits for connection impedance in bioelectric signal acquisition devices suffer from high power consumption due to the constant operation of the detection operational amplifier module.
Innovation Solution
A detection circuit with a switch unit that forms a straight-through channel when an object is connected, allowing the main operational amplifier to stop operating and reducing power consumption, while using a logic processing unit to control the switch and enable/disable the operational amplifier as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the detection operational amplifier module is always in an operating state to detect connection impedance, then the detection reliability is improved, but the power consumption increases excessively
Solution Approach 1:
The patent applies the dynamics principle by making the operational amplifier module switchable between operating and non-operating states. A switch unit is introduced to dynamically control the connection between the front-end circuit and back-end circuit, allowing the operational amplifier to be activated only when detection is needed and deactivated during normal operation, thus resolving the contradiction between continuous detection reliability and power consumption.
Solution Approach 2:
The patent implements periodic action by using the switch unit to periodically activate the operational amplifier module for detection purposes. Instead of continuous operation, the module is activated in periodic intervals or on-demand based on detection requirements, maintaining detection capability while significantly reducing overall power consumption compared to always-on operation.
2Measurement precision
If the main operational amplifier operates continuously to ensure signal acquisition, then the signal acquisition quality is improved, but the response speed to connection changes is reduced
Solution Approach 1:
The patent applies preliminary action by pre-configuring the switch unit to rapidly connect the operational amplifier module to the circuit when connection changes are detected. The switch unit is positioned and designed to enable quick activation of the operational amplifier, ensuring that high-precision signal acquisition is ready immediately when needed, thus improving response speed without sacrificing measurement precision.
3Device complexity
If the detection circuit uses a simple straight-through channel to reduce complexity, then the device complexity is reduced, but the leakage current increases
Solution Approach 1:
The patent introduces the switch unit as an intermediary element between the front-end circuit and back-end circuit. This intermediary component enables the system to switch between a simple straight-through channel (when switch is open) for low complexity and a controlled connection path (when switch is closed) for low leakage current during operational amplifier operation, thus resolving the contradiction between circuit simplicity and leakage current control.
Data Source
AI summary
The present invention provides a detection circuit for a connection impedance and an electronic device. The detection circuit includes: a detection operational amplifier module, wherein the detection operational amplifier module includes: a first buffer, a switch unit, and a main operational amplifier; a first input terminal of the first buffer is connected to a first acquisition electrode through a first front-end circuit, an output terminal of the main operational amplifier is connected to a back-end circuit, and an output terminal of the first buffer is connected to a second input terminal of the first buffer; a first terminal of the switch unit is directly or indirectly connected to the first front-end circuit, and a second terminal of the switch unit is connected to the back-end circuit; and the switch unit is configured to: control the first front-end circuit to be directly connected to the back-end circuit, to form a straight-through channel.