CMOS implementation of a Programmable Attenuation Amplifier based on Switched Capacitors for an optical encoder system

GABRIEL GABIAN; ARIEL LUTENBERG; JOSE LIPOVETZKY

Bs As

Conferencia; 2014 Fifth Argentine Argentine Symposium Symposium and Conference Conference on Embedded Embedded Systems Systems (SASE/CASE); 2014

?Optical encoders are sensors used to measure linearor rotational displacements in industrial and scientific equipment,such as radars, plotters, microscopes, etc. In previous papersour group presented the design of a customized photodetectorarray for a non-diffractive beam (NDB) optical encoder andthe associated electronics. In those works the displacement wassensed by means of a generated photocurrent. In this work wepropose a new scheme that uses voltages instead of currents basedon a programable gain switched capacitor amplifier. The designwas implemented in a standard 0.5µm CMOS process and wascharacterized using an optical set up