A quadrature demodulation method based on DSP Builder and the circuit design used in EIT
10.3760/cma.j.issn.1673-4181.2009.05.005
- VernacularTitle:基于DSP Builder的EIT正交序列解调方法与电路设计
- Author:
You WU
;
Hong SHA
;
Chaoshi REN
- Publication Type:Journal Article
- Keywords:
Electrical impedance tomagraphy;
Quadrature demodulation;
Real and imaginary parts;
DSP Builder;
Quartus Ⅱ
- From:
International Journal of Biomedical Engineering
2009;32(5):276-279
- CountryChina
- Language:Chinese
-
Abstract:
Objective To design and develop a quadrature demodulation circuit for detection of ampli-tude and phase information in EIT measurement. Methods A model structure file was built in matlab/simulink using the elements in Ahera DSP Builder and verified by simulated stimulation. Then the model file was convert-ed to VHDL file via Signal Compiler, and the synthesis, adaptation, simulation and hardware implementation were accomplished. Results The simulation and testing results show that the circuit can extract the real and imagi-nary information of the measured signal and it also meets the EIT measuring requirement, with acceptable mea-sure error. Conclusion The demodulation circuit based on DSP Builder can precisely give real and imaginary information of EIT and provides technological support for full-information complex impedance measurement.
