Quick question - possible to build high-power current-source Class D amp?

[454Casull]

By current-source I mean transconductance (e.g. Pass First Watt).

How powerful could such an amp be? Of course, high fidelity is also a requirement.

[analogspiceman]

Originally posted by 454Casull
By current-source I mean transconductance (e.g. Pass First Watt).

How powerful could such an amp be? Of course, high fidelity is also a requirement.

Power possibilities would be no different than any other class-d amplifier.  High fidelity, on the other hand, would be a little more problematic (only because getting clean current feed back is way more trouble than simply hanging a 1 percent resistor on the output as with voltage sensing).  However, in theory, distortion numbers should be no different than with a voltage source type amplifier.

By the way, with both current and voltage signals available, feedback could be tailored to give an amplifier any theoretically realizable output impedance verses frequency characteristic (so that a class d amplifier could be made to look like a source in series with a lossless eight ohm resistor, for example).

Regards -- analogspiceman

[454Casull]

Ah, thanks for the response.