Jefferson Daniel de Barros Soldera, Julio Saldana, C. G. Penteado, H. Hernández, R. A. Hernandez, Fernando Chavez Porras, Marcos A. Valerio, Angelica dos Anjos, Paulo H. Trevisan
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On-chip 4to20mA reconfigurable current loop transmitter for smart sensor applications
An on-chip 4to20mA reconfigurable current loop transmitter with four input channels for remote smart sensor applications is presented. The designed system includes: a like-HART protocol based on frequency-shift keying modulator (FSK) and demodulator to an efficient communication in industrial environment, a power management sub-system, a standard 4to20mA output and an embedded NVM memory (256 bytes) for calibration and identification purposes. The integrated circuit was fabricated in standard 0.6um CMOS technology occupying an área of 11.1mm2.
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