A bipolar optocoupler isolation amplifier with high precision and wide bandwidth.
- Author:
Xuetao SHI
1
;
Fusheng YOU
;
Zhenyu JI
;
Feng FU
;
Ruigang LIU
;
Xiuzhen DONG
Author Information
1. Department of Medical Electronic Engineering, Faculty of Biomedical Engineering, The Fourth Military Medical University, Xi'an 710033, China.
- Publication Type:Journal Article
- MeSH:
Amplifiers, Electronic;
Electric Impedance;
Equipment Design;
Humans;
Tomography;
instrumentation
- From:
Journal of Biomedical Engineering
2005;22(5):870-874
- CountryChina
- Language:Chinese
-
Abstract:
To fit the technological requirements in electrical impedance tomography system, an improved bipolar optocoupler isolation amplifier based on single analog optocoupler was realized. The experimental results illustrates that the full power -3dB bandwidth of this circuit is greater than 800 KHz, the equivalent output noise is lower than 50 uV(RMS), and the linearity at +/- 4 V inputs is lower than 0.01%. In addition to these features, the circuit also have the advantages of simple structure and no distortion caused by mismatch between analog optocouplers.
