A multichannel synthesizer and voltmeter for electrical impedance tomography Export

@inproceedings{citeulike:3857733, abstract = {This paper describes the signal generator and voltmeter design for a high-speed, high-precision electrical impedance tomography (EIT) and its implementation in a field programmable gate array (FPGA). Since the EIT inverse problem is highly ill-posed it requires that the applied and measured signals have very high precision. In our application we need 16 bits of control for the sources and 16 to 19 bits of precision for the voltmeters. The signal generator design reported here includes a direct digital synthesizer (DDS) and a complex modulator to generate a sinusoidal waveform with controllable amplitude, frequency and phase. The modulated output is then sent to a D/A converter (DAC) to produce an analog signal. The voltmetering is performed using a complex matched filter that produces estimates of both the real and quadrature parts of the voltage. Many samples are used to produce a single voltage measurement, producing measurement precision greater than that of the A/D converter (ADC). The digital sinusoid signal is used as a coherent reference by the matched filter. The implementation of 8 signal generators and voltmeters in a single Xilinx Virtex-II field programmable gate array (FPGA) is presented.}, author = {Liu, N. and Saulnier, G. J. and Newell, J. C.}, booktitle = {Engineering in Medicine and Biology Society, 2003. Proceedings of the 25th Annual International Conference of the IEEE}, citeulike-article-id = {3857733}, citeulike-linkout-0 = {http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=1280800}, comment = {IS Impl. Details: Implements FRA with FPGA's; 1 FPGA provides 8 channels; use DAC and ADC everything else is digital signal\_gen Details: Uses digital lookup table adc Details: Describes resolution gain from oversampling }, journal = {Engineering in Medicine and Biology Society, 2003. Proceedings of the 25th Annual International Conference of the IEEE}, keywords = {adc, fra, signal\_gen}, pages = {3110--3113 Vol.4}, posted-at = {2009-01-07 17:28:34}, priority = {2}, title = {A multichannel synthesizer and voltmeter for electrical impedance tomography}, url = {http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=1280800}, volume = {4}, year = {2003} }

TY - CONF ID - citeulike:3857733 L3 - citeulike-article-id:3857733 N2 - This paper describes the signal generator and voltmeter design for a high-speed, high-precision electrical impedance tomography (EIT) and its implementation in a field programmable gate array (FPGA). Since the EIT inverse problem is highly ill-posed it requires that the applied and measured signals have very high precision. In our application we need 16 bits of control for the sources and 16 to 19 bits of precision for the voltmeters. The signal generator design reported here includes a direct digital synthesizer (DDS) and a complex modulator to generate a sinusoidal waveform with controllable amplitude, frequency and phase. The modulated output is then sent to a D/A converter (DAC) to produce an analog signal. The voltmetering is performed using a complex matched filter that produces estimates of both the real and quadrature parts of the voltage. Many samples are used to produce a single voltage measurement, producing measurement precision greater than that of the A/D converter (ADC). The digital sinusoid signal is used as a coherent reference by the matched filter. The implementation of 8 signal generators and voltmeters in a single Xilinx Virtex-II field programmable gate array (FPGA) is presented. JF - Engineering in Medicine and Biology Society, 2003. Proceedings of the 25th Annual International Conference of the IEEE EP - 3113 Vol.4 TI - A multichannel synthesizer and voltmeter for electrical impedance tomography VL - 4 T2 - Engineering in Medicine and Biology Society, 2003. Proceedings of the 25th Annual International Conference of the IEEE SP - 3110 KW - adc KW - fra KW - signal_gen N1 - IS Impl. Details: Implements FRA with FPGA's; 1 FPGA provides 8 channels; use DAC and ADC everything else is digital signal_gen Details: Uses digital lookup table adc Details: Describes resolution gain from oversampling AU - Liu, N AU - Saulnier, GJ AU - Newell, JC PY - 2003/// UR - http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=1280800 ER -