ABSTRACT
This chapter shows that the differential amplifier is an important system for distortion cancellation of electromagnetic common-mode noises induced in conductors and instrument signal cables, typical of industrial environments. It describes the most relevant aspects of basic electronics in applications that would affect from their operational qualities. An operational amplifier is typically available and ready for use, but it is important to understand its constraints and limitations in the operation. Unlike the ideal amplifier, a realistic operational amplifier circuit may not have either infinite gain nor infinite passband gain. Operational amplifiers may be used to process either analog signals or digital signals. Precision diodes can cancel out the knee voltage of diodes within the operational amplifier feedback. Specific features such as differential input, feedback, and cancellation of common errors in signal acquisition will make such electronic amplifiers a more suitable device in interfacing electronic circuits or processes, monitored by microcontrollers, or microprocessors or computers.
