Difficult Problems:
Generally, there is a balance resistor in the inverting/in-phase amplifier circuit. What is the role of this balance resistor?
(1) Provide a suitable static bias for the transistors inside the chip. The internal circuitry of the chip is usually directly coupled, it can automatically adjust the static operating point, but if an input pin is directly connected to the power supply or ground, its automatic adjustment function is not normal, because the chip inside the chip The voltage of the ground wire cannot be raised, and the voltage of the power supply cannot be pulled down. This causes the chip to fail to meet the conditions of virtual short and virtual disconnection, and the circuit needs additional analysis.
(2) Eliminate the influence of the static base current on the output voltage, and the size should be balanced with the equivalent resistance value of the external DC path of the two input terminals, which is why it is named. 
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