Title :
Diode Zener feedback preamplifier for zero-crossover optical encoders
Author :
Rovati, Luigi ; Salvatori, Giorgia
Author_Institution :
Dept. of Inf. Eng., Univ. of Modena & Reggio Emilia, Italy
Abstract :
A novel preamplifier system to improve the performance of zero-crossover optical encoders is presented. The network is based on a low-noise operational amplifier with a Zener diode feedback. We propose to exploit the non-linear characteristic of this network to reduce the angular measurement uncertainty. The circuit has been accordingly developed and tested in operation.
Keywords :
Zener diodes; angular measurement; feedback amplifiers; measurement uncertainty; operational amplifiers; photodetectors; preamplifiers; angular measurement uncertainty; diode Zener feedback preamplifier; fine circular grating scanning; four-quadrant photodiode photodetector; incremental encoder; low-noise operational amplifier; nonlinear characteristic; precision optical encoders; zero-crossing detection scheme; zero-crossover optical encoders; Circuit testing; Diodes; Low-noise amplifiers; Measurement uncertainty; Nonlinear optics; Operational amplifiers; Optical amplifiers; Optical feedback; Preamplifiers; Stimulated emission;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 2004. IMTC 04. Proceedings of the 21st IEEE
Print_ISBN :
0-7803-8248-X
DOI :
10.1109/IMTC.2004.1351568
