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[White Paper] Transconductance vs Voltage Amplifiers

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      The purpose of an amplifier in a motion control system is to provide a controlled amount of current or voltage to a motor based on a command signal from the motion controller. This is done by a current (transconductance) or voltage amplifier. Each of these two type of amplifiers has benefits and drawbacks which must be considered in order to choose the correct structure for a given motion control application. This paper will examine the similarities and differences between the two main types of switching amplifiers by addressing three key areas: performance, safety, and efficiency.


Figure 1: Typical H-Bridge Circuit of Switching Amplifier