PERFORMANCE ANALYSIS OF PSEUDORANDOM ABSOLUTE POSITION ENCODER WITH EMBEDDED SERIAL PSEUDORANDOM/NATURAL CODE CONVERTER

Milan R. Dinčić, Milica S. Stojanović, Goran S. Miljković, Dragan B. Denić

DOI Number
https://doi.org/10.2298/FUEE2501109D
First page
109
Last page
126

Abstract


Pseudorandom absolute position encoders represent an advanced version of the widely used absolute position encoders, particularly suitable for high-resolution angular position measurement. This paper presents a detailed performance analysis of the pseudorandom absolute position encoder with embedded serial pseudorandom/natural code converter, focusing on the maximum operating frequency and the absolute error in angular position measurement. The generalized analysis, applicable to various resolution values, represents a significant contribution of the paper. Determining the maximum operating frequency involves a detailed analysis of propagation delays in the serial code converter circuit. It is demonstrated that encoder resolution profoundly impacts performance, with a dual effect: higher resolution decreases the absolute error but also reduces the maximum operating frequency, necessitating the determination of the most suitable resolution value for each specific application. In addition to its theoretical importance, the generalized analysis aids practical application by facilitating performance calculations and the selection of the most suitable resolution for specific applications. The performance evaluation was conducted for code converters implemented using the widely used 74LVC logic circuits, considering a 6-bit converter as a representative example of converters with a single XOR logic gate in the feedback loop of the shift register, and an 8-bit converter as a representative example of serial converters with three XOR logic gates in the feedback loop. By applying the proposed analysis, the maximum clock frequency was determined to be 29.85 MHz for both resolution values (6 and 8 bits). Simulations in NI Multisim software validate the performed analysis, showing a strong correlation between simulation and theoretical results.


Keywords

angular position measurement, pseudorandom absolute position encoder, pseudorandom binary sequence, serial pseudorandom/natural code converter, propagation delay analysis

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References


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