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[A bipolar optocoupler isolation amplifier with high precision and wide bandwidth].
Xuetao Shi1, Fusheng You, Zhenyu Ji
1Department of Medical Electronic Engineering, Faculty of Biomedical Engineering, The Fourth Military Medical University, Xi'an 710033, China.
Summary
An improved bipolar optocoupler isolation amplifier was developed for electrical impedance tomography systems. This circuit offers high bandwidth, low noise, and excellent linearity, enhancing EIT system performance.
Area of Science:
- Electrical Engineering
- Biomedical Engineering
- Signal Processing
Context:
- Electrical impedance tomography (EIT) systems require high-performance isolation amplifiers for accurate measurements.
- Traditional isolation amplifiers can suffer from distortion and noise, limiting EIT system capabilities.
- The development of improved analog optocoupler circuits is crucial for advancing EIT technology.
Purpose:
- To design and implement an improved bipolar optocoupler isolation amplifier suitable for EIT systems.
- To achieve high bandwidth, low noise, and excellent linearity in the isolation amplifier.
- To overcome limitations of existing designs, such as distortion caused by analog optocoupler mismatch.
Summary:
- A novel bipolar optocoupler isolation amplifier utilizing a single analog optocoupler was realized.
- Experimental results demonstrate a full power -3dB bandwidth exceeding 800 KHz.
- The circuit exhibits equivalent output noise below 50 uV(RMS) and linearity better than 0.01% at +/- 4 V inputs.
Impact:
- The improved amplifier enhances the technological capabilities of electrical impedance tomography systems.
- Its simple structure and lack of distortion from optocoupler mismatch contribute to more reliable EIT data.
- This advancement facilitates more accurate and robust EIT imaging for medical and industrial applications.