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From: artie on 6 Feb 2010 13:04
In article <4b6d4351.799953(a)news.tpg.com.au>, James Palmer
<jamespalmer(a)lifestat.com> wrote:

> I am building a workbench function generator from an XR2206 chip.
>
> Would anyone here have a tested circuit for an amplifer that I can fit
> that can provide _DC_ to 2MHz at 2A output?
>
> Push/pull running off 12VDC single rail would be ideal.
>
> Best regards,
>
> James Palmer

What are you trying to drive? 2 amps from a 12v single rail supply is
a fairly low impedance load.

There are plenty of high current buffers and power op amps out there --
but they want split supplies. And heat sinks.
From: Paul Keinanen on 6 Feb 2010 16:18
On Sat, 06 Feb 2010 10:31:24 GMT, jamespalmer(a)lifestat.com (James
Palmer) wrote:

>I am building a workbench function generator from an XR2206 chip.
>
>Would anyone here have a tested circuit for an amplifer that I can fit
>that can provide _DC_ to 2MHz at 2A output?
>
>Push/pull running off 12VDC single rail would be ideal.

What do you mean by DC ? A stable DC output at +6 V ?

Theoretically (without Vbe losses), you would get 4 Vrms from a +12 V
supply, at 2 Arms the load would appear to be 2 ohms. The Exar chip
output impedance is 600 ohms, so the buffer stage would have to have a
current gain of much more than 300.

Clearly inpossible for a simple complementary pair emitter follower
stage at 2 MHz. A Darlington configuration might be usable with a
smaller voltage swing due to the Vbe losses.

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