This basic differential amplifier, while appearing not very complicated, ... Ultra-Low Voltage and Ultra-Low Power Differential Amplifier Circuit. Oct. 8, 2008.

Consider a differential op-amp circuit that has a positive input with gain of +5 and a negative input with gain of –5 (Fig. 1). R F was selected to be 100 kΩ. The input resistors are 100 kΩ/5 ...