An automatically compensated readout channel for rotary encoder systems

Author

Maschera, Davide ; Simoni, Andrea ; Gottardi, Massimo ; Gonzo, Lorenzo ; Gregori, Stefano ; Liberali, Valentino ; Torelli, Guido

Author_Institution

Centro per la Ricerca Scientifica a Tecnologica, Ist. Trentino di Cultura, Trento, Italy

Volume

50

Issue

6

fYear

2001

fDate

12/1/2001 12:00:00 AM

Firstpage

1801

Lastpage

1807

Abstract

Presents a readout channel for high-performance rotary encoders. It includes a photodiode, which transduces light pulses into current signals, and the corresponding readout electronics, which produces the digital output related to the angular position information. Digitally programmable calibration is provided to compensate for spreads in the impinging light power. Care was taken to ensure thermal stability and minimize noise contributions of the readout electronics. These features improve the performance of the presently used absolute encoders and reduce the cost of the whole encoder system. Experimental evaluations on integrated prototypes demonstrated the correct operation of the circuit with an optical input power from 0.5 to 4.5 μW at a maximum frequency of 500 kHz

Keywords

angular measurement; calibration; optical sensors; photodiodes; readout electronics; thermal stability; 0.5 to 4.5 muW; 500 kHz; absolute encoders; angle measurement; angular position information; automatically compensated readout channel; digitally programmable calibration; impinging light power; noise contributions; optical input power; optical sensors; optoelectronic integration; photodiode; rotary encoder systems; sensor interface; thermal stability; Calibration; Circuit stability; Costs; Frequency; Integrated optics; Optical noise; Photodiodes; Prototypes; Readout electronics; Thermal stability;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.982984

Filename

982984