[Question] VHF amplifier

Hi all,

For example if an sine wave of 100Mhz, amplitude of 1V, Vdc of 2V, go in to a VHF amplifier.

The VHF amplifier will amplify the amplitude? or it'll amplifly the DC voltage of the sinewave?

Another question, what's the approximate value of Vdc and amplitude of an audio signal coming out from a MP3 player?

Thanks in advance.

Jason

If the amplifier is AC coupled, usually the case for a VHF amplifier then it will only amplify the AC component of the signal within its operational bandwidth.
If the amplifier is DC coupled then it will amplify the complete signal AC & DC.
Peter

Hi,

How can I know an amplifier is AC or DC couple? Can you give me some examples?

Thanks in advance

Alex

You can easily see this in the circuit diagram of the amplifier. If there is a capacitor in series with the RF input connector, then the amplifier is AC coupled. This capacitor is often called "DC blocking" capacitor or "coupling" capacitor. The same applies for the RF output of the amplifier.