The output of a Class C amplifier is present for what portion of the input cycle?

A Class C amplifier is designed to conduct for less than half of the input cycle, typically around 120 degrees to 180 degrees. This means that it only amplifies the input signal during a small portion of the cycle, particularly during the positive half of the waveform. The specific conduction angle allows Class C amplifiers to achieve high efficiency, making them suitable for applications like RF transmission where power efficiency is crucial.

When a Class C amplifier conducts for less than half the input cycle, it restricts the amount of time that the output signal is present, which also contributes to generating a more spectral purity and a cleaner output for radio frequency signals. This characteristic is what distinguishes Class C amplifiers from Class A and Class B amplifiers, which conduct for more extensive portions of the input cycle.