Endoscope Signal Transmission Circuit With Reference Current Linearization
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Solution Overview
Problem
Existing signal transmission circuits in endoscope systems face challenges in reducing offset currents and achieving linear output characteristics across a wide voltage range, which complicates the design of current-voltage conversion circuits.
Innovation Solution
The proposed signal transmission circuit incorporates an impedance conversion circuit with a current source and current output circuit that outputs a second current based on the difference or sum of the input current and a reference current, reducing offset currents by controlling the reference current, and includes a switch to manage electrical connections between the impedance conversion and current-voltage conversion circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional impedance conversion circuit without reference current is used, then the circuit structure is simple, but offset currents cannot be eliminated and the voltage range requirement for linear output becomes excessively wide
Solution Approach 1:
The patent applies preliminary action by generating a reference current in advance that matches the offset characteristics of the impedance conversion circuit. This reference current is then combined with the input signal current before conversion, preemptively compensating for offset errors and enabling linear output over a practical voltage range without requiring excessive voltage swing.
Solution Approach 2:
The patent introduces a reference current as an intermediary element that mediates between the input signal and the impedance conversion circuit. This reference current acts as a compensating signal that cancels out offset currents, allowing the system to achieve accurate linear conversion without directly modifying the core conversion mechanism.
2Adaptability or versatility
If the voltage range for linear output is widened, then more input signal levels can be handled, but the current-voltage conversion circuit becomes more complex and difficult to design
Solution Approach 1:
The patent changes the current parameters by introducing a reference current with specific magnitude and characteristics that complement the input signal. By adjusting the reference current parameters to match the offset characteristics, the system achieves linear output over an optimized voltage range that balances adaptability with circuit simplicity.
3Measurement precision
If offset currents are not compensated, then the circuit operation is straightforward, but the output accuracy deteriorates
Solution Approach 1:
The patent implements self-service by generating a reference current that automatically compensates for offset errors in the impedance conversion circuit. The reference current is derived from the same circuit elements, allowing the system to self-correct its offset characteristics without requiring external calibration or complex control mechanisms.
Data Source
AI summary
A signal transmission circuit includes an impedance conversion circuit and a current-voltage conversion circuit. A first current is input to the impedance conversion circuit. The impedance conversion circuit outputs a second current according to the first current. The current-voltage conversion circuit converts the second current output from the impedance conversion circuit into a voltage. The impedance conversion circuit includes a first current source and a current output circuit. The first current source generates a reference current. The current output circuit outputs the second current according to the difference between the first current and the reference current or the sum of the first current and the reference current.