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Increase amplitude range of a function generator
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magic:

--- Quote from: gkmaia on March 13, 2020, 07:28:26 pm ---Amplitude amplification 10x the original. So from 18vpk to 180vpk.
Up to 100khz max.
Preffer 50ohm, but could stay with 600ohm as per standard for the device.
No offset voltage.
Linear.
Some noise is acceptable.

--- End quote ---
These are basically specs of a high power speaker amplifier. Somewhat more voltage, somewhat less current.

Single transistor: not really, because such amplifier is inverting, AC coupled, has some 100V of DC offset and its gain depends on load impedance. With a few more transistors some of that could perhaps be overcome, particularly if AC coupling is acceptable. If accurate amplification of DC is required than I think there is no escape from the standard opamp/power amp topologies with LTP input stage and feedback. In any case, a moderately sophisticated class AB output stage will be required to avoid burning hundreds of watts of power in class A.
gkmaia:

--- Quote from: magic on March 14, 2020, 10:16:16 pm ---
These are basically specs of a high power speaker amplifier. Somewhat more voltage, somewhat less current.


--- End quote ---

Yes, that is exactly what I am looking for.
David Hess:
An external amplifier is feasible but not trivial to design (or build at this power level) and as duak points out, the power requirements to drive a 50 ohm load are considerable.

I would probably end up doing a "best effort" design starting with suitable output transistors and working back toward the input but the power requirements add considerable difficulty.
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