Endoscope Differential Amplifier for Cable Resistance Signal Stability
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Solution Overview
Problem
Endoscope systems face challenges in stabilizing and accurately detecting measurement signals due to voltage drops caused by cable resistance, which affects the reliability of image pickup and position detection signals.
Innovation Solution
Incorporating a differential amplifying section and a reference-voltage generating section in the endoscope and processor, respectively, to differentially amplify and stabilize the output signals, reducing the impact of cable resistance fluctuations on signal detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If signals are transmitted via long cable from endoscope to processor, then connection flexibility is improved, but voltage drop and signal stability deteriorate due to cable resistance
Solution Approach 1:
A differential amplifying section is introduced as an intermediary component at the endoscope side to actively compensate for cable resistance effects. This amplifier boosts the sensor output signals before transmission, overcoming the voltage drop caused by long cable connections and ensuring stable signal delivery to the processor.
Solution Approach 2:
The differential amplifying section operates by amplifying the voltage difference between two signal lines while rejecting common-mode voltages. This differential approach creates an equipotential reference system that is immune to voltage drops along the cable, as both signal lines experience equal resistance effects that are subsequently rejected by the differential amplifier.
2Ease of operation
If cable length is increased to allow flexible positioning, then ease of operation is improved, but measurement precision deteriorates due to voltage fluctuation
Solution Approach 1:
The differential amplifying section provides active feedback compensation by continuously monitoring the sensor output and amplifying it with a gain that compensates for the cable resistance. This feedback mechanism ensures that the signal amplitude at the processor input remains stable regardless of cable length or resistance variations, maintaining measurement precision.
Solution Approach 2:
The differential amplifier acts as an intermediary signal conditioning stage that isolates the sensitive sensor from the long cable transmission. By placing the amplifier at the endoscope side close to the sensor, it prevents cable resistance from degrading signal quality, enabling flexible cable routing without sacrificing measurement accuracy.
3Measurement precision
If cable resistance is reduced to improve signal quality, then measurement precision is improved, but device complexity increases due to additional correction circuits
Solution Approach 1:
The differential amplifying section is designed to automatically compensate for cable resistance effects without requiring external calibration or complex correction algorithms. The circuit self-adjusts by amplifying the differential signal with a gain proportional to the expected cable resistance, providing robust signal conditioning with minimal complexity.
Solution Approach 2:
Rather than attempting to reduce cable resistance through material or design changes (which would increase complexity), a differential amplifying intermediary is introduced to actively compensate for the resistance effects. This approach achieves high measurement precision through signal processing rather than physical modification, keeping the overall system complexity manageable.
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
This configuration ensures stable and accurate detection of sensor output signals, even with varying cable and connector resistances, enhancing the reliability of image pickup and position detection in endoscope systems.
Implementation Method 1
a differential amplifying section configured to differentially amplify an output signal from the sensor
Implementation Method 2
a reference-voltage generating section configured to generate a reference voltage supplied to the differential amplifying section
Data Source
AI summary
An endoscope apparatus includes an endoscope including a cable and a sensor and a processor. The endoscope includes a differential amplifying section configured to differentially amplify an output signal from the sensor. The processor includes a power supply circuit configured to generate a reference voltage supplied to the differential amplifying section. The reference voltage generated by the power supply circuit of the processor is supplied to the differential amplifying section of the endoscope via the cable. An output signal of the differential amplifying section is detected by the processor via the cable.