I'm struggling to make progress on a problem...

I require amplification of a signal from a communications modem between the frequencies of 100kHz and 1MHz. It is to drive an inductive coupler to a power line. The aim is to drive current on a primary winding so the signal is induced on the secondary winding (which really is just the power line going through the toroidal inductive coupler).

Could I use an audio amplifier and extend the frequency range?

Are there any other options?

Thank you.

 

The working bandwidth of an audio amplifier is much lower than the required bandwidth. You should design an amplifier, it is easy with op amps, which can work up to 1 MHz with the needed gain. Also, you need to make a more careful PCB design for reliable operation at high frequency.