A high input impedance single-ended input to balanced differential output amplifier
- Spinelli, Enrique Mario
- Haberman, Marcelo Alejandro
- Guerrero, Federico Nicolás
- Garcia, Pablo
DOIAbstract
A high input impedance circuit to convert a single-ended (SE) voltage to its differential counterpart is proposed. It allows setting the common-mode (CM) output voltage to a reference voltage vR, while providing gain and a balanced output. The circuit, intended to work as sensor front-end for instrumentation applications, can be implemented by using available commercial devices, thus proving a solution for board-level design of instrumentation systems. It is based on operational amplifiers and can be tailored to specific requirements such as low noise levels, low bias currents or limited power supply voltages. The CM output voltage is controlled by a closed loop scheme, that results in a very good balance between circuit outputs. In order t...
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