2A wide amplifer for XR2206 sig. gen.

It will be difficult to get AC output down to 0Hz with a single rail power supply. The only way I can think of off the top of my head is to incorporate a polarity inverting converter to get a dual-rail +/- supply inside the unit anyway.

If you don't mind dc offset at the output for the triangle and sinusoidal waveforms or if you want only rectangular pulses, then it would be possible to use a single rail PS.

Float the supply and use a couple of power devices to split it in half.

Cheers

Phil Hobbs

I like the power opamp from TI. OPA544. It won't make your 2 MHz. spec though.

Buy two of them and use one to define ground as Phil H. suggests.

If 2MHz is important you'll have to roll your own output stage.

George H.

exactly, a Virtual ground :)

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.

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.