Communication circuit with pulse modulation for transmission of signals from sensors

In order to obtain a high degree of reliability and very good performances, the modern sensors must be capable to integrate in a single unit the logical control module, as well as conditioning and communication modules. In this paper we present the results obtained in the design and implementation of a reliable communication circuit based on pulse modulation techniques for transmission of signals from sensors. The proposed circuit is intended to be integrated in an intelligent sensor that is capable to condition and transmit the measured signal to a remote data acquisition system. By using this novel implementation based on pulse modulation techniques for transmission, is achieved higher immunity against the external electrical noises and the useful information can be easily and correctly recovered with a proper receiver. Also the proposed architecture allows the multiplex transmission on the same channel of the signals from multiple sensors.