I have already completed a KCL analysis on a differential amplifier a while ago, and I posted it to my website.
Recently, I came across a common-mode calculator for Instrumentation amplifiers. This calculator is used to determine the voltages of the internal nodes to ensure that they will not violate the input-common mode ranges of the remaining internal amplifiers. The voltage expressions seemed complicated, but after looking at them it seemed that each voltage source on the input was multiplied by the appropriate signal gain equation, and then they were all combined together (see first attachment).
So, I decided to test that against a typical KCL analysis and it works! If each voltage source is treated separately like the others are not involved, then is this the superposition theorem at work? I will have to dig out my text book to review the text book definition of superposition.
Recently, I came across a common-mode calculator for Instrumentation amplifiers. This calculator is used to determine the voltages of the internal nodes to ensure that they will not violate the input-common mode ranges of the remaining internal amplifiers. The voltage expressions seemed complicated, but after looking at them it seemed that each voltage source on the input was multiplied by the appropriate signal gain equation, and then they were all combined together (see first attachment).
So, I decided to test that against a typical KCL analysis and it works! If each voltage source is treated separately like the others are not involved, then is this the superposition theorem at work? I will have to dig out my text book to review the text book definition of superposition.
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