What determines the VCC value in a typical BUFFER amplifier?

The VCC value in a typical BUFFER amplifier is primarily determined by the required voltage by the load. In a buffer amplifier configuration, the purpose is to provide high input impedance and low output impedance, effectively isolating the input signal from the output load.

To ensure optimal performance, the VCC (supply voltage) must be set to a level that matches the requirements of the load it is driving. If the load requires a certain voltage to function correctly, the VCC must be set accordingly to provide that voltage. This allows the buffer to operate within the required range without distortion or signal loss, ensuring that the output signal faithfully represents the input signal.

Factors like the output impedance, internal resistance of the amplifier, and average signal level, while important in the overall design of an amplifier, do not directly dictate the value of VCC as the load's voltage requirements do. VCC must provide enough headroom for the amplifier to function adequately under the expected load conditions.