TY - JOUR
AU - Jovanović, Uglješa
AB - AbstractOptical rotary encoders generate nonlinear sine and cosine signals in response to a change of angular position that is being measured. Due to the nonlinear shape of encoder output signals, encoder sensitivity to very small changes of angular position is low, causing a poor measurement accuracy level. To improve the optical encoder sensitivity and to increase its accuracy, an improved linearization circuit based on pseudo-linear signal generation and its further linearization with the two-stage piecewise linear analog-to-digital converter is presented in this paper. The proposed linearization circuit is composed of a mixed-signal circuit, which generates analog pseudo-linear signal and determines the first four bits of the final digital result, and the two-stage piecewise linear analog-to-digital converter, which performs simultaneous linearization and digitalization of the pseudo-linear signal. As a result, the maximal value of the absolute measurement error equals to 3.77168·10−5 [rad] (0.00216°) over the full measurement range of 2π [rad].
TI - An Improved Linearization Circuit Used for Optical Rotary Encoders
JF - Measurement Science Review
DO - 10.1515/msr-2017-0029
DA - 2017-10-01
UR - https://www.deepdyve.com/lp/de-gruyter/an-improved-linearization-circuit-used-for-optical-rotary-encoders-3iIN2eROaz
SP - 241
EP - 249
VL - 17
IS - 5
DP - DeepDyve
ER -