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Altera_Forum's avatar
Altera_Forum
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15 years ago

amplifier for output of THDB_ADA

I have an OFDM transceiver with SMA output from the THDB_ADA (Terasic) board. I need to amplify this output to drive a line. I am asking for about 1 AMP into a variable load (between 10 ohms to 600 o...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Actually, yes, 1A into 600 Ohms would be too much. The input impedance is non-constant and frequency dependent because of multipath effects on the power line. My simulations suggest that it will vary between 10 Ohms and about 300 Ohms and also have spikes at certain frequencies. Impedance matching will be extremely difficult so I guess my aim is to couple sufficient power to carry the signal from one part of the line to another.

To increase the power, i'm looking for an amplifier able to operate between about 0.5 MHz and 5 MHz. Output power about 20W I guess. I haven't been able to find such an amplifier - it seems like the no man's land between audio and RF.