CMOS front-end for optical rotary encoders

Author

Maschera, D. ; Simoni, A. ; Gonzo, L. ; Gottardi, M. ; Gregori, S. ; Liberali, V. ; Torelli, G.

Author_Institution

Centre per la Ricerca Sci. e Tecnologica, Ist. Trentino di Cultura, Povo, Italy

Volume

2

fYear

2000

fDate

2000

Firstpage

891

Abstract

This paper presents a front-end circuit for optical rotary encoders. The light pulses modulated by the encoder disc are transduced into current signals, which are pre-processed and converted into digital waveforms related to the angular position information. The proposed front-end circuit is compensated against temperature drifts. Digitally programmable calibration is provided to account for spreads in light pulse power. Measurement results on integrated prototypes are shown

Keywords

CMOS integrated circuits; calibration; circuit feedback; circuit stability; digital readout; encoding; mixed analogue-digital integrated circuits; photodetectors; position control; position measurement; signal processing equipment; transducers; 0.5 to 3 W; 500 kHz; CMOS front-end circuit; angular position information; current signals; digital waveforms; digitally programmable calibration; encoder disc; integrated prototypes; modulated light pulses; optical rotary encoders; temperature drift compensation; Circuits; Data mining; Light emitting diodes; Optical modulation; Optical pulses; Photodiodes; Pulse measurements; Pulse modulation; Temperature; Thermal degradation;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronics, Circuits and Systems, 2000. ICECS 2000. The 7th IEEE International Conference on

Conference_Location

Jounieh

Print_ISBN

0-7803-6542-9

Type

conf

DOI

10.1109/ICECS.2000.913019

Filename

913019