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[083] Citation: Abstract
A single chip system is designed, implemented, tested and analyzed
for the measurement of velocity from incremental optical encoders with
quadrature outputs. The system uses a field programmable gate array
(FPGA) chip to take advantage of high flexibility and a low cost design
cycle. The device uses two counting methods: period counting for low
velocities and frequency counting for high velocities to obtain high
resolution measurements for a wide range of velocities with a fixed
16bit word length. Verification testing of the device was consistent
with the error analysis and showed that quantization errors can be made
arbitrarily small by adjusting the trade-off between velocity range and
minimum resolution. This trade-off can be adjusted by the designer by
simple modifications to the basic design.
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Updated: Tue Aug 19 09:16:09 2008
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