TY - GEN
T1 - Design of IIR filter in capacitive rotary position sensor based on FPGA
AU - Zhang, Yuming
AU - Zheng, Dezhi
AU - Xing, Weiwei
AU - Fan, Shangchun
PY - 2012
Y1 - 2012
N2 - In the capacitive rotary position sensor, noise jamming generated by the motor is mixed in the response signal, so it is difficult to measure precisely. This paper presents an IIR filter solution with cascade structure. An IIR band-pass filter of 8-order is designed by Matlab, and then be disintegrated into 4 sub-filters. The band-pass frequency of the filter ranges from 18 kHz to 22 kHz with date sample rate of 400 kHz. All coefficients of the sub-filters are quantized by 2 14 to satisfy the multiplication requirement in FPGA. The filter is described modularly by Verilog HDL and implemented in FPGA of Cyclone III series. The filter has been tested well with square wave. Signal attenuation outside the band-pass frequency is more than 50 dB. Modular structure makes it very convenient to design filters with different characteristics. At present, the solution is applied in a capacitive rotary position sensor.
AB - In the capacitive rotary position sensor, noise jamming generated by the motor is mixed in the response signal, so it is difficult to measure precisely. This paper presents an IIR filter solution with cascade structure. An IIR band-pass filter of 8-order is designed by Matlab, and then be disintegrated into 4 sub-filters. The band-pass frequency of the filter ranges from 18 kHz to 22 kHz with date sample rate of 400 kHz. All coefficients of the sub-filters are quantized by 2 14 to satisfy the multiplication requirement in FPGA. The filter is described modularly by Verilog HDL and implemented in FPGA of Cyclone III series. The filter has been tested well with square wave. Signal attenuation outside the band-pass frequency is more than 50 dB. Modular structure makes it very convenient to design filters with different characteristics. At present, the solution is applied in a capacitive rotary position sensor.
KW - Capacitive rotary position sensor
KW - FPGA
KW - IIR filter
KW - cascade structure
UR - http://www.scopus.com/inward/record.url?scp=84867314566&partnerID=8YFLogxK
U2 - 10.1109/ISICT.2012.6291598
DO - 10.1109/ISICT.2012.6291598
M3 - Conference contribution
AN - SCOPUS:84867314566
SN - 9781467326162
T3 - 2012 the 8th IEEE International Symposium on Instrumentation and Control Technology, ISICT 2012 - Proceedings
SP - 143
EP - 146
BT - 2012 the 8th IEEE International Symposium on Instrumentation and Control Technology, ISICT 2012 - Proceedings
T2 - 8th IEEE International Symposium on Instrumentation and Control Technology, ISICT 2012
Y2 - 11 July 2012 through 13 July 2012
ER -