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 degital waveforms related to the disc angular position information. The proposed front-end circuit is compensated against temperature drifts. Digitally programmable calibration is provided to account for spreads in impinging light pulse power. Measurement results on integrated prototyps are shown, demonstrating correct operation of the front-end with an optical input power from 0.5uW to 3uW up to a signal frequency of 500KHz in a temperature range from 0 C to 80 C
An Integrated CMOS Front-End for Optical Absolute Rotary Encoders
Gottardi, Massimo;Gonzo, Lorenzo;Simoni, Andrea;
2003-01-01
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 degital waveforms related to the disc angular position information. The proposed front-end circuit is compensated against temperature drifts. Digitally programmable calibration is provided to account for spreads in impinging light pulse power. Measurement results on integrated prototyps are shown, demonstrating correct operation of the front-end with an optical input power from 0.5uW to 3uW up to a signal frequency of 500KHz in a temperature range from 0 C to 80 CI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
