Title :
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
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;
Conference_Titel :
Electronics, Circuits and Systems, 2000. ICECS 2000. The 7th IEEE International Conference on
Conference_Location :
Jounieh
Print_ISBN :
0-7803-6542-9
DOI :
10.1109/ICECS.2000.913019
