BJT Differential Amplifier

AI Thread Summary
In a BJT Differential amplifier, the maximum and minimum values of the common-mode input voltage can be determined based on the amplifier's configuration and the given parameters like beta and resistor values. The common-mode rejection ratio (CMRR) plays a crucial role in how effectively the amplifier can reject common-mode signals. The input circuit indeed influences the common-mode input voltage, as it directly affects the voltage levels presented to the amplifier. Ultimately, the amplifier's design limits its ability to fully eliminate common-mode signals, making it essential to consider these factors in the analysis. Understanding these principles is vital for optimizing amplifier performance in practical applications.
kahei
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In a BJT Differential amplifier, how to find the maximum and minimum values of the common-mode input voltage? Beta and the resistors are given.
 
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Doesn't that depend on the input circuit? I mean, that is an input to the amplifier. All the amplifier itself can do is to partially reject the common mode input voltage that is given to it.
 

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