吉林大学学报(工学版) ›› 2016, Vol. 46 ›› Issue (2): 602-608.doi: 10.13229/j.cnki.jdxbgxb201602039

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Design of interpolation chip for small photoelectric encoders

DING Ning1, 2, LI Hai-bin1, 2, PENG Le-li1, 2, YU Zhi-shuai1, 2, CHANG Yu-chun1, 2   

  1. 1.State Key Laboratory on Integrated Optoelectronics, Jilin University, Changchun 130012, China;
    2.College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
  • Received:2014-08-22 Online:2016-02-20 Published:2016-02-20

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Abstract: In order to improve the resolution of low precision small photoelectric encoder without increasing the encoder size and the scribed line number, an interpolation chip is designed that is suitable to small photoelectric encoder. First, the advantages and disadvantages of current electronic interpolation methods are analyzed, considering the resolution, precision, the circuit complexity and integration, and other factors. Based on the theory of phase modulation, an interpolation algorithm is proposed, which converts the measurement of spatial phase displacement to that of time difference value of instantaneous cycle. Then, the overall architecture of the whole chip is designed according to the algorithm principle, and each module of the chip is designed using Cadence software. The instantaneous cycle value of the modulation signal is obtained by simulation of the overall chip circuit. Finally, the measured spatial angular displacement after subdivision is compared with the theoretical value, and the subdivision precision is calculated. Experiment results show that, when the frequency of the photoelectric encoder signal input is in the range from 1 kHz to 100 kHz, the chip can realize optical signal segment of 0 to 100 times. When the input is at 100 kHz, the precision of 0.4571' can be achieved. Compared with other similar processing circuit, the designed chip has the advantages of high integration level, combining the distinguishing function and subdivision, good portability, and has certain engineering application value.

Key words: photoelectric encoder, interpolation chip, measurement of spatial phase displacement, resolution, precision

CLC Number: 

  • TP212.1
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