These Resistors at the input terminal are called as Variable Resistors. 3 below shows a typical Binary Weighted Resistor Converter Circuit which consists of an Op-Amp, four resistors which are connected at the input terminal of Op-amp along with the Feedback Resistor. The output is generated through this Summing Amplifier Circuit. These resistors are connected across the inputs and the summing point. In this type of Converter, every digital input bit that needs to be converted, requires one resistor or current source.
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